From a Fantasy baseball perspective, here's one opinion on Gavin Fien: Selected 12th overall in the 2025 MLB Draft, the 6'3'', 200 pound Fien is a big boy with the big power to match from a fast and powerful righty swing. I don't exactly love the swing though. It's oddly stiff. It's like his batting coach is Charlie from It's Always Sunny in Philadelphia. "What you want to do is lock your knees in place and then snap your back up." It's working though, and I never want to get too hung up on swing mechanics, especially when it's working for a guy. He has size, power, and feel to hit, and while the pro debut wasn't great (75 wRC+ in 10 games), I wouldn't let it swing your thinking in either direction.
ETA: 2029 Prime Projection: 77/25/84/.257/.336/.464/8