[MizunoJoe]

This is where with all due respect I think Mr Tommessello went a little wrong with his advice to throw the club straight down, vertically into the ground from top. Your intention should be the net result of the divergent vectors ! The intention should be to throw the club down plane which is what he actually displayed when hitting a ball. Even though his arm motion if seeen in isolation (isolated from pivot motion in a drill say ) would be more down than out. If you know what I mean. The intention is to reach for the keys! Or glass or whatever.

No disrespect for TT intended ... one of the greats.

This is exactly the reason TT is one of the greats! Although he uses an alternate aiming point, his mind is still in the hands.

He isn't throwing his arms down plane, he throws them down while the pivot alone provides the forward, resulting in the sweetspot moving down plane. This is the illusion seen in the some of the most powerful swings.