yeah, its been working for hundreds of players that I gave the advice too.
and yes, you will always have enough time, you just need to learn to move...
Question remains, what will he be like in 5 or 10 years time when he has matured for figured out, or grow taller/more built etc, as many other youth...
the playing motion/stroke of inverted loop and SP is very different.
if you rely heavily on spin from inverted rubbers, then SP isn't ideal for you....