Low hoping Leo is rival sexual towards Alban. Like Alban thought he felt hostility from Leo through that hand shake, but it was raw sexual tension for a strong worthy opponent.
Think about the opposite situation, where we get a vomit of characters with little screen time and no character development. I think we are okay at this pace of new characters.
I love this manga. And looks like everyone else does too. Such a wonderfully engaging work and the author is a master at making the unknown detailed yet ambiguous in nature.