Well UNC*** fan, that's a good question. If Booker (not Boker), and Lyles were both back, it may depend on a lot of things. Does their shooting improve? Does Booker work on his athletic abilities so he can be a better defender?
The problem with Lyles was he could consistently hit the high school 3 pointer on the college court, but it only counted for 2 points. His range never started to extend past that, so he could only spread the floor so far, but he could take his man inside and be efficient. Booker could really spread the floor, but rarely beat his man off the dribble. Now, he shot over his man a lot, but rarely beat him off the dribble to the basket. Transition is the only time where we seen him get to the basket uncontested consistently. He just doesn't have that speed and ball handling in the half-court, and not a huge offensive arsenal to help with his lack of explosiveness. Aaron Harrison, for example, was not an explosive athlete, nor was he a consistent shooter, but he has a pretty diverse offensive skillset. He finds ways to get the ball to the rim without athleticism, primarily along the baseline, but besides the point.
We haven't had a really athletic guard with that size, that could shoot 3 pointers that consistently in some time. That has the opportunity to offer more for the rest of your offense. On defense, with that kind of shooter with that kind of athleticism, do you back off so you don't get beat off the dribble, or do you play close and risk getting beat off the dribble to the rim for points, or a kickout for a 3?
It really depends on too much to answer now. Reality is though, they're not back, and they can't start here. My common sense would direct me to saying Booker and Lyles though due to experience, size, and assuming they make progressions on both ends (plus, it's 2 players at that position, vs only 1 of Mulder). But in that scenario, I would start Mulder at the 2, and nothing would change that, because we would probably do that stupid a** platoon swap again this season if they came back, and Briscoe would likely get significant PG time.