You can look at this two different ways:
Positive.
Samuel knows the Brady offense and had his best season with Joe as his OC. He also brings a dimension of speed and explosiveness has been lacking. Brady has also shown that he can utilize the talent better than Dorsey could as evidenced by James Cook, Khalil Shakir, Ty Johnson, and Dalton Kincaid who all came on after he took over.
Negative.
Samuel runs 70% of his snaps out of slot. The Bills have Shakir who established himself as an upcoming slot receiver. Is Samuel going to take snaps away from a promising player? Also at this point in his career Diggs seemed to trending into more of a slot receiver.
You can argue that while Buffalo gets a player with more speed, they now have 3 WR’s best suited for slot WR and not a true outside WR unless you include Hollis.
Either way it’s a signal that Buffalo is doubling down on what Brady wants to do on offense. They tried the same under Ken Dorsey and he never found a way to really get the most out of players like OJ Howard, James Cook, or Nyheim Hines. Hopefully that changes