At this point, I'd personally prefer to continue to watch Jake play off of the ball. It's obviously worked out well thus far.
At the point, I think you really hope for Russell to come around. He's got the size and shooting ability to be an offensive threat, but defensively, he's got a long way to go. If KSU can't secure a really nice JUCO PG, I think you'll see Russell and Irving fight it out.
Now, there are two scenarios. One, if Irving wins the job, you have to play McGruder at the three. There is no way that you can have two players on the floor at the same time who aren't true scoring threats (Irving & Sutton). You'll have to play McGruder at the three to open up the offense on the perimeter, or the other team is just going to choke the ability to feed the ball inside.
The second scenario is if Russell starts. If he comes around, I'd see Sutton still starting, but I still think you need McGruder out there. He has the ability to score from the wing, on the perimeter and inside, which would hopefully prevent teams, like Butler and Kansas, from trying to double our guards.
The bottom line is that McGruder needs to start, ultimately, and if he does, you can probably swap Russell and Irving interchangeably depending on the defensive matchups or the need for perimeter scoring. Truthfully, it's kind of a moot point because the bulk of our talent will reside in the frontcourt, so what we need on the perimeter is solid defense, which Irving and Pullen provide, and you can let the front court take the bulk of the scoring between Asprilla, Kelly, Samuels, and Judge.