So this is a case of 'be careful what you ask for'.
Given raiding is almost a thing of the past due to the advancement of castle buildings that can dump you free res, is this champ really needed?
But what it will do is significantly increase the cost of trying to buy a champ through the random loot box process.
Rather than it being a 1 in 56 chance of getting what you want (25% Grade V chance, with 1 in 14 champ type)
It would become a 1 in 60 chance (4 x 15).
If you aren't a maths kind of person then adding the extra champ will make it cost over 7% more expensive to buy champs.
So benefit of a raiding champ vs 7% increase in champ buying price....... is this really in any players benefit? We really shouldn't be asking for this, totally not in our best interests.