Gruber mocking aside, Biagini legitimately has a pretty nice arsenal, fit for that of an at worst 4/5th starter type. Like you said, it'll be interesting to see what happens when he's facing the hitters for a second and third time, how the fastball plays when it's some ticks slower, and if that big overhand curve has the same sharpness and soft-contact inducing abilities when hitters start to sit on some of his pitches.