RG3 is excited to have a catcher like Vincent Jackson to score with? Or maybe RG3 is just excited for the fact that playing with Vincent Jackson improves his chances of scoring?
Probably ecstatic that Vincent Jackson puts him a position to better attack the (defensive) backfield.
He's going to look forward to spending long after-hours with Jackson in preparation, teambuilding and study.
RG3's ballhandling in playaction will be helped by Vincent Jackson's presence. Vincent Jackson is one of the best at catching long balls.