Taysom. That's simply QB fundamentals. Watch NFL QB's they throw to receivers while the DB is draped all over them and they often throw into double coverage. Part of being the QB is trusting your receivers and placing the ball in a spot your guy has a chance to make a play on it.
Taysom is still struggling there. Unless his guy has 3+ yards of space Taysom doesn't trust the situation more often than not. When he develops the confidence to "throw his receiver open" then this offense will be extremely legit. Until then BYU will occasionally be one dimensional and easy to stop.