I think the latter posts are losing site of the original question. It's not one system throwing up 3 horses, it's 3 systems picking a different horse. If you have independant systems they presumably have their own staking plans so the horse and the bet are predetermined.
If you believe in the systems, which you obviously do, just make the bets they tell you, cheer when one of them wins and curse gently to yourself when all three lose.

KV