You cant watch Lower from Suicide, and if you stay there its sooooo easy for a CT to just peek you with a Scout/Awp, heck even a M4A1-S is easy to kill you there because you literally barely have space to run around
if you're faster with the Awp it doesn't matter. Also it really doesn't matter anyway just have a player lurk in tuns. Your lurk should just always assume there's a CT in lower and hold for the rush or clear it. They only thing this really changes is that T's now have to take a risk to deal damage to crossing CT's.