What Democrats will try to do here in the event of an Edelen candidacy is try to distract Republican monies and have some wave insurance. Edelen will probably manage both quite respectably, but we're not very likely to hear "Senator Edelen".
Senator Edelen can win this race. Look what happened in OH, Portman was safe, poll after poll have given Strickland the lead. Sen majority will be nice with pickups in OH/KY, FL, NH, WI & IL.
You realize the election in Ohio is more than a year from now, that Portman has way outraised Strickland, and that many prognosticators still have Ohio as Leans R, right?
In any case, even if all the races you list go Democratic, the Democratic Senate majority won't be "nice"; it'll be an exceedingly narrow 52-48 and probably doomed once elections happen in IN/MO/MT/ND in 2018.