I'll rephrase then. If the young bowler has any intentions of becoming competitive at a higher level, then hooking a back up ball down 10 board at the 10 pin is highly unlikely to get him there. It's one of lowest probability shots there is for it. I'm working purely with the numbers here. On a house shot, you've got lots of oil from 10-30, and not very much oil outside 7. They miss left and the ball just keeps on skating, they miss right and the balls reads earlier. Both lead to potential misses. What happens on Short or dry patterns, will he adjust to down 20? Or on long? down 5?? Straighter is Greater. I wonder how many pro's have potential 15 board shifts for the 10 pin? I'll take the under on 5.
Also, using Belmo isn't really a relevant counter argument. What he does is different, granted. Not advisable? At the time of his growing up, yes, but definitely not the case these days. However, that's where the similarities end for me. Belmo and Osku have created highly efficient ways of creating power and revolutions. Something which probably wasn't truly understood 3-4 years ago, let alone 10+ years ago when Belmo was growing up. However, the simple math of throwing back-up down 10 at the 10 pin shows us that this, especially on a house pattern, is a low percentage shot. Especially when compared to other, and in my opinion, much simpler, methods. I'm happy to be proved wrong here, and for that junior turn into the greatest tenpin shooter I've ever seen, but I don't like the numbers behind it.
I have no problem with people striking their own way. It's one of the best part about this game. However, when it comes to sparing, there is no where near as much leeway.
Cheers, Cow