You think he's out of form? I'd call it more counting the days & keeping out of harms way in the meantime which doesn't constitute downing tools? It's being street smart, with an eye on the future.
Have you considered that after last season ended, Sanchez was straight on ConFed duty & straight after that he was staring at another PL season without a break & no pre-season?
On top of that he was forced to honour his contract at a club he has no interest in or future with. Wenger made a wrong call over his transfer & the player is understandably pissed with him. Did you see the Arsenal training video where Sanchez & Wenger ignored each other?
Question: If we could go back to this summers' transfer window, with the power of hindsight, what do you reckon Wenger's view on Sanchez's transfer would be? Would he dig his heels in, or take the £60m on offer & move on?
I think you're taking his 'supposed' loss of form in isolation without considering one iota of the extenuating circumstances surrounding Sanchez at this present moment.
To discount all of this will probably explain why you see this as purely 'Sanchez is out of form'.
You've admitted about three times there potential for downing tools. You have used the same argument many have to you about him sulking not getting his own way. I'm not against him coming, my original post was in reply to you saying "there are no negatives" there are negatives, but positives too.