"so is this a snide jab at KOL for being a lil too T-REXish?"
Not at all - why would anyone doing a gigposter want to make a jab at a band that they are supposed to be promoting.
Just a cool 70's image for 2 bands with obvious 70's influences.
Is KOL like T-Rex? I must have heard the wrong songs. I keep hearing that they sound like bands that I like but I have yet to hear a single song that sounds anything like say, the Black Crows or T-Rex.