one thing Calvert has that you can't coach is pace , i 'am sure over the next few years he will bulk up
he has had a slight dip in form last season , (probabley the first time ever as a pro or amature ) which was his second full season in pro rugby which does happen.
sure he will come back stronger this season. he still got 20 odd tries in the seasons he has played, and its always nice to have someone in your side when your under pressure who can go full length to score. ok his defence is not great but give me calverts pace anytime . just remember when your out watching RU ------ whitehaven is a massive step up in class