I think that depends on how well we like the receivers likely to be there in the 3rd round. If we find someone we like a lot in that range you go an pick him and forget about Isabella. However if you are just meh on what's there, then I think Isabella offers a more immediate potential producer at that "#6" guy,
WR's are soon going to evolve into that area where drafting them early WILL be a wiser decision than in the past, but not necessarily because the position is so important, but because with the salaries of even good but not great WR's is now OVER $20MM/yr and truly elite guys will be approaching $30/yr, you REALLY will need to start developing your own guys in order to keep your cap costs under control