This is the hilarious part anytime someone compares it to crash or spyro. They literally took the original games and threw HD textures at everything. They didn't remake a damn thing from the ground up, as proven by them being so lazy that they simply used Crash 3 physics for games 1 and 2 which make them play like shit.
In LA literally everything short of the dialogue had to be remade from the ground up, also they started work on it right after they finished MM3D so I can say with certainty it took a hell of a lot longer to make then the crash/spyro remasters activision shat out.