WR play in college is in large part completely contingent on OC & QB.
Unless you're a freak athlete like Justin Jefferson or Ja'marr Chase types, the majority of your success/productivity will hinge on the system you play in & the QB you have.
Dawson's system is WR friendly, it's the opposite of Gattlesses "system", which means WR's in this Offense are interchangeable.
As long as they have prerequisite ability in terms of decent speed & hands, you can pretty much plug & play most WR's in this system & they'll be able to at the very minimum get 500+yds.
Horton benefitted from playing in Dawson's Offense & having a Davey O'Brien award winning QB. If he's smart, he'll go somewhere that has a similar system & good QB if he wants to maintain his numbers.
Just look at Colbie Young, compare his numbers at Miami vs UGA
- in Gattlesses system
- in Dawson's Creek system
- in Mike Bobo's system
When you're not a top 60 NFL draft pick caliber WR, pretty much 80+% of your productivity is dependent on OC & QB.
In other words, it really doesn't matter to what degree Daniels is "better" than Horton, as long as we have a good QB in this Offense, his productivity is already baked into the system.