Just because it took 3 weeks to pop does not mean that he gets 0.33 per session. If he started at 0.00 and got 0.49 per session his progression would go as follows.
0.00 -> 0.49 -> 0.98 -> 1.47
You're absolutely right. The maximum possible, in my situation, is 0,495.
I was overjoyed and counted one extra week, i suppose

I think 0.60 is accurate for a short guy, but a guy that tall should get significantly less.
Its hard for me to dismiss statistical findings that easily. On the other hand, i respect the opinion of people that have more time in the game and training, than me.
Next time i train him in passing, will be following some pressure and handling sessions, to maximize all contributing factors.