Yes, Cannon and Fleming MIGHT get every opportunity to show what they have at OG in training camp and in the preseason. Of course, that didn't happen much last year. My guess is that Fleming might indeed be a future RG. I still see Cannon as a fine OT.
That being said, I think that it's great to have all that competition on the right side, at RG and at RT.
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I'm not sure that the potentials of Fleming and Cannon at OG are relevant, unless one thinks that Wendell will move to lG, where I don't think that he has played.
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BOTTOM LINE
1) We have one LG in Kline.
2) We might sign or trade for a veteran.
3) We need to sign one or two OL's in the draft who can play LG.