Someone mentioned upthread about bars being a problem on a team of Biles, McCallum, DiCello, and Chiles, but all of them are actually quite strong on the event. Biles is a World medalist and finalist, DiCello just went 14.6 at Classics, McCallum was 2nd reserve for bars finals at Worlds (2-per’ed of course), and Chiles is a solid 14+ backup. If Biles, DiCello, and McCallum hit in TF, you’re only looking at a .2-.5 improvement on the team score by bringing a specialist to the main team.