I'm not sure about the upside from what we have seen. I will say this though, I think it's hard to get into a good passing rhythm with an everyone eats offense that runs the ball half the time.
On Sunday vs Tampa Joe Brady came with more of an up tempo, chunk play, passing attack. The kind of passing attack Bills fans have grown accustomed to seeing.
The kind of passing attack that can give a young WR like Keon Coleman a better chance to succeed IMO.