Another Godzilla thought crossed my mind *SPOILERS*

Thats a good theory but I think he's might be a younger one but I think because of all the cheap shots that knock him down were again cheap shots. I think this godzilla is a lot like Man of Steel just learning how to use his powers and how to fight. I think this godzilla is the last of its kind and if he died the godzilla race is over. I also think this is his first fight and he would have lost if it wasn't for Aaron. I also think this is the first time he had to handle missions (bridge scene) and that's why he's groaning because he has never felt anything like it before and in the 2 or 3 movie he will be able to handle it because he knows what they feel like by now. I also think in the 2 or 3 movie he will mature and will be able to handle monsters more easily

In the movie they state that the bones found are not Godzilla's and are much older.

well, in that scene when they first arrive in the mine, Dr. Serizawa confirms that the skeleton never belogned to the same species as Godzilla, but it was something similar. Godzilla was actually handling the situation just fine and was gonna finish off the female until A-hole winged muto comes in and they decide to double team him. Until Ford blew up the nest and distracted the female, giving Godzilla enough time to gain energy to use his atomic breath. but I can see where you thought that.

To those people that are saying he is weak: LET ME SEE YOU TAKE ON TWO ENEMIES AT ONCE, ONE BEING ABLE TO FLY, AND THE OTHER THAT IS ABLE TO KNOCK YOUR ASS TO THE GROUND!

BTW, KUROCHAN_24, that last part is not directed toward you, just for those who think he's weak. 

@KUROCHAN_24 Yeah, me too!