So basically a striker is someone who can do something with the ball under pressure? So what were we doing with Dzeko who was mostly shit in that situation, but proved he knew where the back of the net was? I've always said that Dzeko was a good goal scorer but an average footballer and I'd say that Kelechi was a better footballer than Dzeko imo.
On the second part of what you said, what happens to strikers who can get on the ball and do something with it, but couldn't hit a cows arse with a banjo where goal scoring comes into it? Are they not strikers then? I mean IIRC, Adrian Heath went nearly two season's without a goal but Reid kept selecting him over Clive Allen who near enough scored every time he took to the field.
Also what about those players who couldn't trap a bag of sand in general play AND still couldn't score even if they were holding the ball whilst strapped to a GPS Exocet Missile Smart Bomb? Bernardo Corradi springs to mind........ Personally I think what constitutes a main striker is very open to debate because from what I can see there are basically two types, good ones and shit ones but perhaps I'm being too simplistic.
Kelechi is twice the footballer Dzeko is, but I know which one I'd back to get on the end of one of Joe's howitzers.
But you are asking me questions & seem to have missed the line: '..as well as score goals ' ? And are asking me whether I think a 'main striker' should score goals ?
As well as the line: ' get on the ball & do something with it, in a typical match situation' ? And are asking me what happens to a main striker who can't do that ?
The answer would be: sell him.
Let's recap:' A 'main striker' imo, is someone who can get on the ball & do something with it, under pressure from defenders, in a typical match situation, as well as score goals.' That's my opinion. If you have a main striker who struggles with either, you potentially weaken the team. That's how a main cf should be imo. Tevez, Aguero, Negredo could all do that in their own different ways. Dzeko, Balotelli less so, but still both have done it on numerous occasions.
The criticism of Dzeko was that he failed to get on the ball & use it properly, but he scored goals. When he didn'tscore, he was often a liability. Last season, he couldn't score or lead the line either, so he's gone.
Kelechi has tended to let the ball run away a little bit & make a few iffy decisions, & hasn't got the presence of Dzeko or the experience of the other 'stand in' strikers, so the manager is possibly a little bit hesitant about whether to trust him in certain situations or not.
I don't see any great fault in that either way personally. As he gets used to the role & settles in & makes better choices, the manager will trust him more.
Right now, it might have worked, it might not. I'd take the chance, but I fuly understand why the boss didn't & I don't even understand why it's such a big thing in that game.