But the current Terrorsaur toy's robot mode is accurate! It's the cartoon model that deviated from the toy, not vice versa. The original toy designers would've required a time machine in order to travel to the future to see how Mainframe's animators would adapt the Terrorsaur toy as a cartoon model, then travel back to their original point in time and attempt to tweak the Terrorsaur toy to make it look more like the cartoon. This in turn would create a multitude of questions regarding temporal paradoxes (would they actually be able to alter their own universe or create a new one or destroy their original one etc.???).
The cartoon wasn't even out yet when I got Terrorsaur, so the idea of how he looked compared to the show was never an issue. And when the show did come out, I actually thought that the toy still looked better. The larger wings on the toy makes him look more majestic instead of those stunted puny bat-wings on the show model. Pteranodons have six metre wingspans! It doesn't make sense for him to have itty-bitty wing-a-lings like in the cartoon. I also prefer the colours on the toy ... the black and purples look nicer and help break up all that red, which the show model doesn't do nearly as well. But I must admit that the beak looked nicer on the cartoon model, although both the toy and cartoon were anatomically incorrect in giving the beast mode teeth; like modern birds, Pteranodons had toothless beaks. Toy pteranodons are often erroneously given teeth by toy-makers (making it look more like a Ludodactylus instead).