Hi Tommm.
It's never easy to helm the national team. I've had my share of that and so has a few others here. We (as in Malaysia) have entrusted the job to Ahmoi this season with the full knowledge that he would do his best for the country within the limitation of the resources available. Ahmoi, much to his credit has been very transparent and forthcoming in the running of the NT, hence this thread and others. Also to his credit, he has welcomed criticisms from everyone as well as inputs. I believe he has his valid reasons for not playing your kid as much as you want him to, and I truly believe, that is ultimately his decision to make as he knows best. As one other forumer here has mentioned, we can't judge as we do not know the attributes of your player, but we are fully backing (at least I am) the decisions of Ahmoi.
Tommm, take this as an inducement for you to further train up your player. Ask Ahmoi on the skills that he wants your player to be improved upon further. As you've rightly said, he's still in a trainable age, so go forth and train him up.
Cheers, and thanks for looking after this Malaysian player so diligently. I'm truly grateful to you, Tommm for taking the trouble and initiative to groom him to be one of Malaysia's greatest player.