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I'd say Charles and Fairbrother are more than just potential starters, chucky as well.
Charles starting depends on the development of Whits, they were pretty even last year, and will probably rotate until somebody puts his hand up.
There's not a lot in the cupboard behind Fairbrother, Dunning can play both sides, so he would count, but Pekka isn't a real option to switch and the other props are still a little behind.
Chucky is a genuine option to start matches this year, after the time he spent in the sevens program, he seems to have developed the confidence in his game, and has picked up his defense as well. I'd see him playing the JT style of game, as a contrast to Sheeno. If that assessment is accurate, chucky wouldn't see the field against the Tajs until about 70 so that Sheehan can hold the line in defense and do a bit of the small forward work that he's so good at.
All in all, we'd pick up a lot, and keep a bit. I would hope that the numbers we pick up (namely sharpie, bam, ripia et al) would organize the team better and therefore help the people around them to tackle better.