Almost every single fighter people consider explosive & or powerful have big muscular legs. Even just for their weight division.
Exhibit A: Benson Henderson
Not the most powerful guy, but no one could deny his explosiveness.
Exhibit B: Michael Chandler
One of the most powerful & explosive fighters in LW history.
Exhibit C: Conor McGregor
He is well known for being explosive and powerful. They are big for his weight class. If not for a sherdogger.
Exhibit D: Tyron Woodley
Renowned for his power and explosiveness in his prime.
I can't think of a single fighter who has stick legs but are explosive or powerful. But even if there are a few, the vast majority lift for dem legs.