From Celtics to Warriors, who are X-Factors in Eastern, Western Conference finals of NBA playoffs?

We know the stars will have a say in the outcomes of the NBA’s conference finals.

Boston’s Jayson Tatum, Golden State’s Steph Curry, Dallas’ Luka Doncic and Miami’s Jimmy Butler are the focal points.

But who are the non-stars – the X-factors – who will make a difference in the conference finals?

Grant Williams played the role perfectly in Boston’s Game 7 victory against Milwaukee on Sunday. Can he do it again at some point during the Celtics’ series against the Heat? Would Dallas be playing in its first conference finals since winning the NBA championship in 2011 without the timely baskets from Spencer Dinwiddie in the Mavericks rout of the top-seeded Phoenix Suns?