There are holes in his theory.....when moving your arm you are limited by shoulder and elbow movement. This technique limits your downward and away from the body movement a great deal, as your elbow only flexes in one direction. The elbow is limited in its ability to move. A traditional goalie is taught to keep his elbows in as his arm moves faster then his elbow can.....it is faster to move your forearm up and down from this position then it is to from Scriven's arm nearly straight out position with elbow fully flexed.....logic is one thing, fighting natural body part movements is another.
This technique has some flaws and the better shooters will expose it. Another thing that this does is change his blocker positioning which effects his stick positioning......a major reason why he gives up so many big rebounds.....I dislike his stick positioning a lot.
I don't think it limits his downward motion at all.
I'm not arguing there is a flaw in his style, but I feel the distinct advantage he has of eliminating the hole that all other goalies leave high to the glove side with worth the negative impact of his style (a hole low to the glove side)
As far as his stick position, I agree to an extent. I don't think it's something he can't overcome with the proper coaching though and don't feel it's a huge issue, but it is something that needs improvement.
I'm not arguing he has some adjustments to make, as do all rookie goalies.
And just to be clear I don't think he's going to be the second coming of jesus christ or anything, but I do think he can be a decent NHL starter.