I don't think there was an obvious alternative to Son for the armband tbh.
Kulusevski has since emerged as a player with a really strong mentality (his interviews are always very impressive and he clearly demands a lot from himself) and his performances are now matching that on a consistent basis.
I'd give him the armband tbh and it might just stop him being pinched in the summer.
I understand why people are clamouring for Kule to be captain but I’m not one of them. I admit he’s the better option than we currently have but I don’t see him as a long term solution.