If they go 30-2, they're projected to have an RPI of 6 and they'd be 9-2 against RPI top 50. They would definitely get a 2 seed in that scenario.
If they go 29-3 or 28-4, they're projected to have an RPI of 8 and 10, respectively. Three seed seems likely in those scenarios.
According to KenPom, the odds of Zags going unbeaten in conference play, let alone the WCC tourney, is only 26%.
If Montana wins out (25-4), we're projected to have an RPI of 46.
At 24-5, projected RPI of 54.
At 23-6 (maybe most likely scenario), projected RPI of 63.
It depends how conference tournaments shake out, but I don't think you're immune from getting a 14 seed if you finish with an RPI in the 60s. So playing Zags a definite possibility. With the usual conference tourney upsets however, I think we'd be more likely to get a 13 seed with an RPI of 63.