Yes, he's struggling - but why death ride the bloke? He's still pretty young, and can still be a valuable player. Just down on confidence. Good defensive instincts to get underneath the ball when it was over the line (was it Minichiello?) and there was zero he could do about the flukey bounce that led to the Cesar try - he had to jump to grab it, allowing Cesar to wrestle it out before he had a proper grasp on it.
IF he gets his head right, and IF Griffin does the right thing by him, no reason he can't become an excellent long-term fullback like Matty Bowen - another small bloke who was criticised at different times for inconsistency, probs under the high ball, defensive deficiencies etc.