I posted a little something in The New MBL story. Something about Doug: he's a shapeshifter, but just because he can turn into a gigantic lizard doesn't mean he can become as powerful as one. So the trick with intimidating another giant lizard only works if the other giant lizard believes the illusion. If he chooses to fight, Doug's in trouble.
BTW, I feel a bit guilty about "getting rid" of the lizard that Eurostar introduced, but it's not destroyed -- just hiding with its tail between its legs for now -- and it can be brought back anytime. I figured our heroes could have a bit of downtime to meet each other before the next threat or whatever rears its ugly head.