Raw Stats:
-- Tua --
Passing: 164 of 237 (69.2%) for 2865 yards, 31 TDs, 2 INT, 212.22 Passer Rating
Rushing: 41 for 184 yards, 4 TDs
-- Murray --
Passing: 196 of 279 (70.3%) for 3310 yards, 34 TDs, 6 INTs, 205.82 Passer Rating
Rushing: 104 for 739 yards, 10 TDs
Second half plus overtime:
-- Tua --
Passing: 34 of 53 (64.2%) for 601 yards, 5 TDs, 1 INT, 186.77 Passer Rating
Rushing: 10 for 73 yards, 2 TDs
-- Murray --
Passing: 65 of 104 (62.5%) for 1175 yards, 12 TDs, 3 INTs, 189.71 Passer Rating
Rushing: 48 for 324 yards, 5 TDs
Fourth quarter plus overtime:
-- Tua --
Passing: 1 of 1 (100%) for 24 yards, 0 TDs, 0 INTs, 301.60 Passer Rating
Rushing: 0 for 0 yards, 0 TDs
-- Murray --
Passing: 23 of 32 (71.9%) for 303 yards, 5 TDs, 0 INTs, 202.98 Passer Rating
Rushing: 19 for 231 yards, 3 TDs
So, it seems that Murray, at least somewhat similarly to Tua, has gotten the majority of his stats in the first half but not nearly as high a percentage as Tua. Give Tua equal second half passing and rushing attempts to Murray and - assuming he maintains his numbers, and there's absolutely no reason to think he wouldn't have against the overmatched competition - his raw numbers would be significantly higher than Murray's.
Also, think about this: the vast majority of Tua's second-half snaps have come against two Top 10 in the nation passing defenses.
Meanwhile, Murray hasn't faced a single Top 40 in the nation passing defense.