Bringing in Becht doesn't have to mean running off Grunk.
1) There would be a competition for the job. Grunk may be good enough to win that.
2) Grunk will not be guaranteed to start at almost any top power 4 school. Look at Beau. He left to be the guy at Missouri and then was sharing reps until the other guy got hurt and then Beau got hurt and seems to have lost his job and is back in the portal. You would think this is a recent enough cautionary tale of someone that Grunk personally knows who transferred instead of waiting one more year.
3) Grunk has 3 years of eligibility. If Campbell brings in Becht and Becht wins the job and doesn't get injured like our QB1 did last year, then Grunk still would almost certainly get 2 years of starting. Also, he would get 3 years of development under Campbell who turned 3 star Brock Purdy into a top NFL starter and now 3 star Becht into a 9000+ yd passer. It is highly unlikely that Grunk could transfer to a staff that has a better current track record at developing this position. Essentially, Campbell is a huge upgrade at QB development over Franklin.
All fair points.
The main thing is that there's an honest competition without Matt putting his thumb on the scale in any way to favor his Iowa State guy Rocco.
Matt strikes me as a straight shooter who has his priorities straight, which is first of all winning football games. I trust him to do the right thing with regard to this QB situation.
The problem will be if Grunk bails by portaling...and then Rocco doesn't pan out.