Hmm...Do not think so...Here is a example:
I have 4 fully equipped mercs and before that change i was able to raid high level players using my high level mercs...
I am 23 lv and my mercs are up to 28... Sure i could harvest the 20 lv players especially when they had up to 2 mercs...
Now i will have 5 mercs, and i will able to attack again the low level players (20 lv) even they have 5 mercs, since i am able to equip them better and i will better that the other hero, just a bit more bloodier battle...And the low level enemy it is not sure that he will use all five...but me at 24 level will be sure...
Off topic
"Me and my little army coming for fresh 20-21 level flesh,
"