I'm pretty sure Waters has a higher ceiling than Sam's, guys. Also, waters has proven himself a pretty good runner.
Likewise, Sams has proven himself a competent payear (although waters averages about 3x the yards per completion)
I like how when we get flat with one (which we do almost every game) which just switch and it's jump started.
FWIW, if anyone is victimized by play calling, its probably waters. They run a lot of plays we shouldn't ever be running with him, particularly early in the year.