I enjoyed the movement of the discussion into philosophy and think it's an interesting one. To me on that basis it's about being the most effective in implementing your philosophy against your opposition, which you can see Chelsea did because they didn't change their philosophy but they kept Oscar on the bench, so their style and philosophy didn't change but the players and their attributes did.
Some people are going with the argument that literally nobody apart from Panty, Boyata or Lopes was fit enough to play on our bench. To me we could still have kept the attacking philosophy but this is honestly where I'd have changed it. Chelsea are a strong, physical and aerially good side so to me it was pointless to keep trying the wing play and relentless crossing, I'd have started differently and morphed it into that because of the need to switch my starting line-up around with subs.
I'd have taken the risk and started Jovetic, and I would have played him as the second striker off Dzeko, kept Negredo on the bench as impact and allowed Silva to roam. For me the way you hurt Chelsea is pace in the middle, so I would have used Navas more centrally, making runs between the fullback and centre back and between the two centre backs, thus moving them out of position a yard and giving Silva and Jovetic that extra space. I would have honestly used Navas as a box to box and used his pace and energy to disrupt the Chelsea counter attacks, he didn't need to be strong he just needed to nip at their heels and slow it down. I would have used the full backs as overlapping width, thus meaning Azpilicueta and Ivanovic would essentially be marking nobody and would be eventually caught trying to come in and providing the space to get round the back but in a meaningful attacking way. With Demichelis then being a holding, deep lying playmaker you have some of the passing of Fern and some of the energy and pace in Navas thus compensating for him better, and you attack Chelsea where I think it would have been more uncomfortable for them, round Luiz, Terry and Cahill in the heart of the defence on the floor with Navas darting in and out as he pleased. Yaya would then be able to push on and go at them at the heart of their defence, rather than deeper, with the cover of Dem and work rate of Navas compensating for him.
It's not ideal playing Martin and Jesus out of their preferred position but by delegating them their strong attributes to use in those roles I think we could have still been attacking but had more of the all round play Fern provides and allowed Silva and Yaya a bit better central service and room to play. Jovetic could maybe have done a half or 60 minutes, then Negredo could come as a battering ram and depending on Navas's state then Jimmy could have come on for 20 mins/half an hour, either keeping the same shape as that or moving it to a wing based system, putting Clichy on and allowing Kolarov to just play as a winger, because sorry but all it takes is him whacking it low into the box for something to happen, if we'd still needed a goal with our resources that would have been a good option considering.
I think we kept our philosophy but targeted the wrong areas to attack Chelsea, and I think you can retain your philosophy but adjust your lineup, formation and tactics to exploit the weakness of your opposition. At least once it was clear our A tactics of getting it wide and going aerially weren't working I think you have to shake it up even if it means moving someone out of position just to get the other team guessing and making a mistake trying to cope with the different threat.
I still feel Pelle was hoping too much that what he'd set out to do would work rather than seeing what was available and using our philosophy to come up with something creative to create new and unexpected threats for the Chelsea backline.
I know people will go "Navas as CM? stupid idea" and shoot me down and state how he was MOTM (despite me thinking he didn't do nearly enough with the amount of ball he got and that Azpilicueta did really well against him) in their eyes, but I think giving Chelsea a taste of what they thought they'd escaped in Aguero being out (the pace and movement) would have presented us with clearer opportunities in better areas of the pitch.