I hate Roethlisberger, but he's been pretty precise these past several years. It's just that his drop back and delivery isn't as pretty as the others you mentioned.
He had an 80 catch 1400 yard season with Blake Bortles. That's his ceiling. Robinson is only limited by the QBs he plays with. He has top 5 ability.
John Brown will never be that. Even Diggs has yet to be that kind of receiver.
It wasn't rhetorical. Alex Smith has never been top tier.
I wasn't suggesting they'd cut bait after this year, but competition will be added if he doesn't take a clear step in the right direction, and it'll happen before the optional 5th year.
When has Alex Smith ever resembled a top tier QB?
The Bills have a window RIGHT NOW! Allen isn't going to get 5 years to struggle without competition for his spot. That much I'm sure of.
He's still playing at a very high level, so no.
*Ted Thompson is the reason he doesn't have more rings. It all began with letting Greg Jennings get away.