It's not hypocritical at all because the risk profiles are totally different.
First, Long is not as good of an OC as BK is a HC, so finding a OC better than Long is likely to be way easier. That's fairly obvious even if you dislike BK. We don't even need the replacement to be "elite" to have experienced a step up, just "great" will do. There's also just way more "great" OCs than there are "elite" HCs out there. It's much more likely that we will hire a great OC than hire Urban or the next Dabo Sweeney.
Second, there's a big difference in hiring/firing head coaches than hiring/firing OCs in terms of money and potential negative effect. Hiring a HC means committing financially to him for at least five years. You can kick an coordinator to the curb if he doesn't work out in two years without feeling too much financial hurt. Even at their most expensive, a coordinator is much, much less of a financial albatross than a bad HC. Finally, a bad head coaching hire can literally set the program back decades. That's not true for coordinators. VanGorder was a total nightmare hire and was about as bad as it can get, but we're close to not seeing the effects of his terrible coaching/recruiting in less than five years.
For all these reasons, I'm way more inclined to take a shot at a new OC over Long. We know that Long's performance is below average. We know that there are better OCs out there to be poached. We know that even if the new OC doesn't do well, he can't do much worse, and we can get rid of him easily in the near future.
It definitely shouldn't be Rees though.
I should have been more clear, I typed in haste.
The risk I refer to is risk to hitting the goal of a NC.
At this point in time, we know the following to be true about BK....
1) For all the rich overtones of being an offense guru, his offenses while at ND have been underwhelming. Really, only the 2015 team is one that you can point to and say was a great offense. Not sure how much of it was Sanford versus BK.
2) We know what a bad coordinator hire can do to ND under BK's watch. See: BVG.
3) Tommy Rees has no documented experience prior to ND beyond being a GA at NW and an "offensive assistant" for the Chargers for one year. Tommy's "offense" is almost assuredly what ever he has picked up from Long and BK.
4) BK's system is so successful, that his coaching tree has produced the ripest fruits for all of the G5 and lower P5 teams to pluck. I mean, who isn't pounding the doors down for Chuck Martin, Bob Diaco, Jeff Quinn, Charley Molnar etc. Butch Jones is probably the most successful and he might be able to coax himself Rutgers.
With all that said, hiring Tommy is akin to prolonging the same failures that have plagued ND since BK's arrival. Sure, you could pull the plug in a year or two if it doesn't work. But this is a path we have already been down and BK's cronies that he brings to South Bend have a poor track record. His best hires (Lea, Sanford, Harry, etc) have come from outside his tree.
That's not to say that bringing in a random HC would be better. But again, if your goal is to win a NC, a HC that has proven himself on a big stage would be a less risky move towards a NC. In all honesty, it probably would fair. Them the odds. But the odds of success are, IMO, higher than if we go down the BK coaching tree path.
I'll put it this way....if someone believes that BK is an OC away from greatness, we need to hire an OC that is completely independent of BK's coaching tree. Tommy Rees is the farthest thing from that.