Whatever he uses after a premade bat will be too fast. That's life. At least it should be very controllable and good. All the pre-mades have rubbers about 30 degree hardness or something ridiculous like that and very slow.
Anyway, yeah I played a lot with Stiga All with MarkVs (It's what we have in the club for amateurs who haven't gotten their own equipment yet, or sometimes xiom musa). It's extremely spinny and slow. For beginners it's super effective because they can do all the shots that they'd otherwise struggle mightily with (like lifting backspin etc).
I think it's the ideal combination after a premade bat or for first-time beginners (which is why we have this at the club).
With that setup, as they get their legs, they can even beat the more advanced intermediates who use fast equipment. If you train in a club with new players as they advance to the advanced groups, you can often see some beginner lift backspin and the more experienced players have problems blocking it because it's too spinny. Much more spinny than it would seem.
That said, there's a lot that's more or less the same. Lots of blades and rubbers. These, I think, are very good.
Rakza7 soft is the step up. After that people already think they're semi-pros and get their TB ALCs with T05s and make so many unforced errors you'd never know they could hold the ball on the table previously