Well, you can test it without finalizing - just unlock the hero you're thinking on fusing, and go to add him to the hero you want to upgrade, keep an eye on the lvl 1/120 .... I just tried it there on a level 1 PG, and when I go about fusing another hero, it jumped to 125, so it does indeed work. Just quit back out if you don't want to go through with it.
Don't worry on Pounder, you WILL get more of them Mine has 6 glory and I also have enough shards to create at least 2 more, will keep those for future evolves. He is 135/150 atm. I just gloried my Chiron yesterday, so he can go to 125. Currently 122. I already had another as aid. I could have used the latest one for aid too, but I have a bunch of PG to upgrade for aid as is. Been lucky on the rolls for aids and glory at least lately. My main PG can now go to 130 as he has 2 glory, sitting at 110 atm. I have only evolved him to second stage.
They're coming along nicely. Since I pretty much stopped playing thi game for about 2 months