i agree on the fact that it's harder to chase the realm who steals the gems, but it's not as hard to simply prevent the gems from crossing gate by either chasing gems down, capturing gate or both, leaving alot of open strategies for the defending realm, i sorta enjoy things as they currently are but that's just my opinion, sucks to see my own realm gems run from the gate w/o being able to chase them but we can always prevent them from getting out the gate
I noticed on this last invasion that there were alot of alsius at noble camping it, they would do best preventing the theft of their gems :P but overall was nice fighting, don't give up on the system just yet, you guys invaded and opened portal a bunch of times at start, you can do it again if you don't give up