Oh I think my wording was wrong, sorry. What I meant was something like, if you have 1 LVL 100 and 1 LVL 20 and the EXP for the horde is 3,000, then without splitting the EXP what it dose is give 100% of the EXP to the leveling mon almost like you killed the hord with the LVL 20. If you have 2 LVL 50 mons it will work by splitting the EXP 50/50, 1,500 for the main and 1,500 for the LVL 50 mon ^^
Not sure if that will make the item too OP, but I feel that will be a cool use for this item