If there's no advantage to getting the latest, greatest toons (in this case, GLs), then no one will pursue those toons.
You may not like it, but for the health of the game CG has to allow (not encourage, but allow) GAC matchups between people with GLs and people without, and TW matchups between guilds with more GLs and guilds with few/none. To do anything else would mean that the winning strategy would be not to develop any new toons, and instead to max out mods.
As someone in a guild that had relatively poor participation and consistently lost in TW (we had a win rate less than 20%, and could sometimes lose 10-20 TWs in a row), I was frustrated with our lackluster performance, but I would never have suggested that the algorithm ban matchups against guilds with a better set of meta toons. About a week ago I moved to a new guild, and they're active and organized and we lost one in a very close match, and then won the next by a blowout. And I can tell you that I enjoyed the loss even more than the blowout win b/c it was my first TW in a long time where people were communicating and sharing strategies, giving each other encouragement.
For me, it's what happens between guild mates that makes a TW better or worse. And though I understand the frustration of losing over and over again, I think it ruins the game to set up a situation in a which a winning strategy is to avoid acquiring meta toons.