Not kind of ilogical. YOu only share something its YOURS. If you're doing beta sharing, it's not you sharing the girl, but the girl wanting to be shared.He could stick to two different paths, not just one. I prefer pure NTR, beta MC with humillation NTR and femdom. He could do an alpha maledom path and an beta NTR path with femdom. Alpha sharing is too niche and is kind of contradictory. I think it shoud not be implemented or be implemented when the game is too far down the line with a minor update. Most NTR succesful games are with a beta MC, it's kind of ilogical to be alpha and be sharing your girls, that's not even normal NTR, it's Netorase, and even most Nerorase games are with beta or kind MC, not alpha.
Netorase is you getting another dude girl, Netorare your girl sleeping with another guy while you feel jealous, alpha sharing is you "abusing" your power over a girl making her to sleep with other dudes or girls.
Nothing ilogical in any of these 3, just personal preference.