I can't see Blake or anyone beating Bolt this year in either event given he's trained well this winter. With Bolt about to edge into his prime along with it being Olympic year, plus the fact he knows he has competition I think he will have had his head in it over the off season! Last years bitter end to his 100m will have only added to it as well!
Not sure about Gay given his injury's and surgery, he's not even opening until June so It could be tough for him, I think he could be in the running for 3rd possibly