Why would it matter they're trained clones? Unless he's power leveled them (which he can't without the originals), how does he expect essentially level 1's to take out anyone who at least participated in the S-Rank subjugations (since he doesn't know onii-chan did both by himself; he probably assumes they at the very least did them together). How many level 1 would it take to hold down even an A rank adventure? Even if he doesn't harm them, there should be nothing they can do to stop him, and hes not even considering the clones possibly joining him given one has already betrayed him; if they're really that well trained, then he should be worrying more about further betrayals than rejoicing in their abilities.