Yes. Not nope. With the wider tire, you'll have a bigger contact patch. A bigger contact patch is better. But, going from 23s to 25s or 28s is such a small jump, the likelihood of that being the deciding factor is staying up or looking like Sagan, is low... really low.
Hopefully, this doesn't turn into a brake debate, but this is where good hydraulic brakes really shine - the ability to modulate and turn an understeer into an oversteer (much easier to recover from) is so much better than rim brakes. But, there's still that Sagan factor - even if you had 40s and hydraulic brakes, would you be able to recover from that unexpected sand, gravel, rut, etc. It's not (always) about the bike.