The first 4* banner was headlined by Roy, Oscar, Barst, and Klein, the second one was headlined by Soleil, Mathilda, Fae, and Jeorge, and the last one was Cain, L'arachel, Nino, and Felicia. I think just about anyone who is desirable fodder (Klein, Hinata), a popular merge project (Nino, Soleil) or a unit with a refine (Felicia, Jeorge) is fair game for this event, though starting with Hinata was definitely the right move since he's everyone's favorite budget A skill fodder.
I don't normally have a strong need for Hinata but since I only got 1 in 500 orbs while sniping for Ike it's nice to have another one just in case. I probably would've given it to the Merric I just started building instead of Brazen Atk/Def if I didn't have only one of him but Brazen is probably a better budget skill for Merric than Fury anyway. It's definitely nice to have Fury for any limited unit I actually like though since it's so hard for me to justify giving rare skills to them.