Tebow doesn't necessarily have to carry the load. If our defense and special teams get a few big plays, Tebow won't have to carry the load at all.
However, if Alabama's defensive line absolutely dominates our offensive line (I doubt it will happen, but it's possible), then Tebow might have to "carry" the load.
Ole Miss' defensive line was pretty successful against us and we still put up 30 points EVEN WITH 3 turnovers. I foresee Alabama performing like Ole Miss, with respect to "the trenches" but I don't think they'll dominate "the trenches" with us like they did with Clemson. Remember, even before they crushed Clemson, Clemson's offensive line was already a question mark and their weakest link. Our offensive line is much better than Clemson's.