On the last point, I believe Kelechi is using his real age, our Football federation actually did something right by starting our youth players from U13's almost a decade ago to fight this. Kelechi is one of the players that was part of it and there's at least picture evidence (something we rarely have to confirm their ages) of him coming to England in 2011 I believe, they even won a tournament against the likes of the youth teams of Arsenal, City, etc....Martins was starring in the Champions League latter stages for Inter at the same age as Kelechi; by '23' his career was the epitome of obscurity.
I do like Kelechi, but I wouldn't bank on him until he's had two/three years in men's football before making an accurate judgement.
Would be interesting to get the Nigerian fella's insight into the alleged age falsifying of players such as Kanu and Taribo West, and whether it's still as rife as it was in the 90's/early 2000's.