While I agree with the guys and "don't box yourself into a corner" mentality, the suggestion that you should shuffle your draft board to grab a WR first doesn't stick for me... in another way, they are "boxing themselves into a corner" with the suggestion to go WR at #1.
Your opening salvo mentions you are very strong at WR. Did everyone else in this thread just completely skip over that? So, use your #1/4/5 on the best RB's available. Or leverage one of the picks into moving back to the 6 and grab Williams plus add'l assets if you can. IMO if you do spend all 3 top picks on RB's, you're going to get at least 2 RB's that should be solid contributors for 6-8 years. For the 9 and 13, again, take the BPA... at the same time, stay fluid and put your toes into the trade market. If you can come away with some future assets at the 9/13 rather than rookie picks, you've probably done fine. I also wouldn't hesitate for a moment to use your 9/13 picks on more RB's. A starting RB is always going to have a trade market.
Ebron/Fleener will be fine options for the next 5/3 years. If you are in love with Njoku, then go for him at 9... maybe OJ Thomas slips to 9 and you scoop him up to cover your bases with Brate.
So yeah, don't put down a blueprint you can't get away from... but don't turn everything head over heels because you're going to come out without a WR. The WR class this year might not be worth investing into.