In effect, you are both talking about the power of branding. The Rifles, strong brand, attracts quality staff and has good recruiting Loggies, weaker brand, attracts weaker staff and has less than stellar recruiting. I don't wan tot get drawn in to an argument about the truth in that statement ; I am commenting on market forces at work, not the merits or otherwise of different units.
I can't help but conclude that the only way the Army is going to hit 30000 reservists is to lever the strong brands to the advantage of the weaker ones. And, if a Loggie 918 says the SCOTS are ******, then focus on sorting that image out.
I don't think the Army has a clue about branding or how powerful some of its brands are.
I suppose the only challenge with this idea (although I like it) is that the army has balanced the reservist trades/PIDs as part of the flawless master plan to maintain certain capabilities for times of crisis.