In reply to lewiz:
I haven't done the route so I'm very much thinking theoretically, but a couple of questions could help you to answer the grade issue:
- Had the hold not exploded, you'd placed a good nut and finished the route without further ado, do you think that the prior absence of that peg would have made it feel any harder; or - assuming you're correct in thinking you'd already done the crux - would it simply involve slightly less protection on easier moves of (perhaps?) 5a/b which would normally be perfectly compatible with the E3 grade?
- Was the ex-hold crucial enough for that bit to now be the crux, or were you simply unlucky in making the wrong choice from several alternatives? If the nut you were about to place really is bomber, could the demise of the hold result in a (well-protected) move hard enough to raise the grade to E4 - ie presumably somewhere in the 6a/b region - or could it now be hard to hang on to place the nut in the first place?
Quite possibly none of this may make any sense to somebody who has actually done the route, or it may help you to direct your musings in a useful direction!