Altidore uses his physical abilities much more than Michy - I don't think they're very comparable. You're just seeing similarities in their lack of a first touch. We'll disagree on Tammy's performance - I thought he was unremarkable. Which, for a player his age is good at this level! But not good enough to be starting for us now.
http://thechels.info/wiki/First_team_squad Chelsea only have 4 homegrown players. Will this being trouble if it stays like this before the season ends.
I assume we could promote some kids to the first squad for a little bit and qualify? I have no idea how it works.
Players who are younger than 21 do not count towards any quota. IIRC that allows us to get away with the quota rules.