Unsworth's issue is that he wasn't good enough to be the manager. He's by all accounts a brilliant guy and clearly a good coach. But he's nowhere near ready and we'd have been in real danger I think.
Our only option was Sam because of how long we've left it. Our best option went from being someone like Tuchel or the level below, like Dyche, who has all what we are looking for, to Sam, because we let the search go on for 6 weeks and in that 6 weeks we leaked goals and remained entrenched in a scrap at the bottom.
		
		
	 
So to be clear, I don't necessarily disagree with you.  Unsworth doesn't have the track record to merit the position.  Too risky.
And yes, the delay put us in a worse and worse bargaining position.  If that's the point, that the job got so bad that only Sam would take it, okay, I get it.  But man, 6M?  You'd think we could've pulled in someone better.
I personally think the BETTER argument as to why Sam is that HOPEFULLY Moshiri and co really want to shake things up in a Ralf Rangnick kind of way.  That's why they made overtures to Fonseca.  That's why they spoke to Ralf.  You can't really ask Fonseca or even Marco Silva to come in and have a successful short turnaround with this personnel as they are so poorly adaptable to modern football.  Seriously, imagine Ralf Rangnick coming in and seeing the number of players old than 24 on this team?  He's literally sell Jags, Stek, Baines, Williams, Mirallas, Lennon, Martina, Morgan, Robles, McCarthy and maybe even Coleman, Gana, Bolaisse, Mori, Siggy and others in the summer.  Rooney probably is going nowhere.  He'd also have to then spend a bazillion $$$ on two starting CBs, a CF, central middy or two, and probably a couple wingers just in January alone.
That being said, my fear is that Sam and Walsh buy the wrong type of players in January so that whoever comes in during the summer (I hope) and overhauls the team can make use of them.  So it's fine to get a target guy, even Hoffenheim uses a target guy, but they have to be able to play a certain way and still run.