Yeah, assuming he's PC cus good dad; i'd recommend helping him find pockets of communities relative to scrimming. I can ask around but i'm sure there is public information that isn't hard to find. Discord has made community building massively easy. I'm not entirely sure about Overwatch, or if its still an issue.. but most teams won't pull you in until you're 18. This could have changed within the last few years, but I remember a few league and csgo players gone pro that were gatekeeped by being 16/17, but 18 insta-signed. It'd also be nice if he gets through the hidden social rankings to skip collegiate leagues; imo, cesspool.
Stewie2k story is a pretty decent one of a kid who was 16, stepped into csgo; skipped all the child-y bullshit(dumb maps, prison break, ect) and started making rounds in the higher level play, by the age of 18 was acquired by C9 and ended up being regarded as one of the best NA CSGO players. I don't know how accurate I am on that, but that is my understood paraphrase.
The whole scrim environment definitely has a reinvigorating feeling(imo) for Overwatch, its nothing like competitive queue and if you put the work into learning teammate personalities/strengths, strategies, calls/roles beyond dps/tank/supp but flex/main/igl ect, compositions.. ontop of working on your own levels of communication and team cohesion with others. If he finds a good group, he might end up w/ a coach and/or be subjected to vod reviews which could lead to even more growth. Potential recognition too.
Either way, i'm jealous haha. I didn't have that support mid 2000's, so I was that twitch kid with god aim and no social skills.. I was at the mercy of my friends and their friends, and couldn't stay dedicated to a singular game despite always falling back on Counter-Strike. Meanwhile, the kid I use to bully's because how he and his brother played golden eye(ie they would index/middle/finger/thumb grab joystick.. and also pick oddjob when you'd beat them but house rules were no one could play oddjob) went pro because he became a cavetroll and grinded out Counter-Strike Source into CSGO.. His name is PTR, nothing crazy but someone I actually knew growing up.. Career is a bit of a spudder because he didn't have a decent system to facilitate him.. but I think hes still around in the semi-pro to pro circuit but not any sort of global prix.
I tried to help my friends little brother recently because he wanted me too, but like most kids.. their attention isn't all that fixated or their maturity/foresight lacks which is fair; they are young.. we ain't raising michael jacksons haha.. but if hes slamming out GM; definitely something to promote because that is some less than 3% of the game population. Now i'm just an old hat, that fuels off the toxicity of others so that I can raise the occasional inner papa bicep and flex muscle memory.. as that train passed for me.. and for overwatch, onetricking hanzo was that juice for a little til I moved on to other ventures. lol