Sorry, a few hours late to re-joining this thread, but there's a big difference between being a good passer within the flow of the offense and being a facilitator of the offense.
Jimmy King & Ray Jackson were real good passers and had "plus" court vision, but were a lot more efficient playing off CWeb or Rose than they were facilitating the offense themselves as Seniors.
Manny Harris, Soph yr DMorris, Burke, Hardaway, Soph yr Stauskas, LeVert.... those guys had offense game suited to facilitate the offense.
When the shot clock gets to 6-7seconds and offensive set hasn't yielded anything, someone has to be the guy to step out to the top of the key and "do something." Irvin was that team appointed guy for most of this season and his efficiency suffered because of it; Walton has stepped up more in that role the last half-dozen games or so and has been more effective than Irvin was. I'm not sure I see anyone who is a natural fit for that role next season --- Matthews or MAAR may default into the role, but neither appears today to be a good fit and both will likely see Offensive Efficiency ratings take a hit because of it.