Your points to some extent are pretty valid, however, you can't just pack him up based on him playing in a different system, it's clear he's still contributing to the team more than others with goals, sometimes Zlatan slows our build up down, he sometimes makes bad decisions and misses a shite load of chances. The new system definitely affects Aguero in the worst way but I'm really confident he will show his class, he's already super committed to City and if they don't want him, will take him at United in a heartbeat.
In my opinion, pep should really try and get the best out of Aguero for a couple of years and then transition over to Jesus slowly, I mean you can;t ignore someone that's scoring over 20 goals in a terrible season by his own standards, obviously it probably won't happen but that's fine, I'm a united fan, whilst I do have a bit of a man crush on Aguero, it definitely plays into our favour. Whilst Jesus is class, he really is no Aguero.
I know what you're saying about Dolberg it was just a little dig at the Ajax fans to remind them of their own doing badly.