Ok, first off there are reports to indicate that there has been some sort of contact with Marshall, but that Texas isn't as interested in Marshall as he is in Texas. Don't know if that's true, but I don't think you can rule that out until they have a new coach.
Secondly, there is no reason at all... none to keep this secret until Friday. That would be incredibly stupid on everyone's part. For one, you want to make Marshall announce it ASAP because it binds him to Alabama. You don't give him time for cold feet, you want the press conference and get this thing buttoned up. Some sort of super secret let's wait thing is the type of deal you'd do when he was still coaching his team in the tournament, not one you do now when Wichita St. would need a new coach and Alabama needs to recruit.
So, all we can really conclude is it's not a done deal yet. May be he's on the line, may be he's not, but Alabama simply can't give him too long. It's both a good sign he hasn't said no, and a bad sign he hasn't said yes. It's like a marriage proposal, if she has to think about it too long that's not a good thing...