okay, Iroh? you listening, good cause I need you to do something. bitch smack him. open hand just straight up spirit bitch smack him.
On a serious note, Aang probably didn't actually play favorites. All the time he spent with Tenzin was more likely him studying and learning Air Nomad culture. The "vacations" were probably just pit stops on the way to Air Temples as both places he mention are near them.
In other words, Aang spent more time with Tenzin because Aang had more he could and needed to teach him. With Bumi and Kya, it's like teaching Katara Air Nomad culture. Interesting but not something they really need to know.
Plus if Aang played favorites like that, I doubt Katara would let that fly.
Aang is a bad father and grandfather, XDXDXD
Personally I think that It was Tenzin's reflection of his dad in the show, but I love what you did in the comic here.
All my friends and I are big fans of you're Korra-related comics. Keep up the great work!
In all seriousness, though, I'm not entirely convinced Aang wasn't just Tenzin's imagination in that scene.