Araki wrote: - Kuririn's request to Goku was indeed related to his decision to leave retirement behind and become a fighter again, as i predicted. I guess that's also why he decides to get work as a cop (after the timeskip next episode, he's doing it already).
I guess he, along with the rest of the gang that was present throughout the entirety, or most, of DB and DBZ's arcs, wants to at least keep up with his training and, to some degree, maintain their martial arts pride, much in the same way Tenshinhan has ALWAYS done, and unlike Krillin and Yamcha for quite a while in the second half of DBZ, most notably the Majin Buu arc. It was cool to see Goku finally interact with Krillin again one-on-one, we haven't seen that for a while, now that I think of it, and it was nice idea to dedicate a few minutes of the episodes to have them spend some time with each other, being best friends and all. Another great move to take advantage of the opportunity the fact this is a TV series presents. If they're careful enough with their planning, there's room and time for everyone, just the right amounts, unlike the somewhat rushed and out-of-nowhere (although obviously approved) appearances of Tenshinhan, Krillin and even Muten Roshi in the Movies, especially Fukkatsu no F. I guess we should be happy with the way they're managing the episodes' time to give the respectful, proper screen time to each character and their respective interactions with the main guys.