My first horse was a POA and I did EVERYTHING on her, I mean jumping, dressage, english pleasure, western pleasure, trail classes, and even barrels and other games. She excelled at running. So I chose to get a new horse for pleasure and quit with gaming. But she didn't sell so I have a gamer and a pleasure horse....
Anyways, from experience, gaming horses (good, fast ones) NEVER make good, winning, slow, relaxed pleasure horses. If you say you got 1st on him in 1d, thenI would NOT change him to pleasure.
Hope it helped!
P.S, I still barrel race and do pleasure...most people don't do both:)