This is an interesting post. I'd forgotten about Angel wiping the floor with the rest of his team in the final arc. By the end of "Not Fade Away" Angel is more powerful than he's ever been. I can't really remember their fight in "You're Welcome" though. Better fighter or not, there aren't many people I'd pick ahead of Angel when it comes time to throw down.
One note about Spike "wanting it more" though. You're right, Angel does say that, but the fact is, that's part of fighting. If you can't gear yourself up enough to win, all the talent in the world won't save you. I mean, as a boxing guy, I've seen that numerous times. Look at the end of Mike Tyson's career. With the ability he had, he never should have lost a fight. But he had such a complete lack of motivation towards the end of his days in the ring that it didn't matter. So if Spike can "want it more" than Angel and win the fight because of that, then he's a better fighter. However, I do realize that aberrations do happen, and Angel could have had a bad day. That happens to.
The fight in
You're Welcome wasn't much of one. It's the scene where Spike bites Cordy to see if she's human, but then Angel shows up and they scrap a little. Spike gets Angel in a headlock, brags about their big fight, to which Angel does a flip, picks Spike up and slams him on the ground.
"
SPIKE
(puts Angel in a headlock)
You took me on and lost, remember, old man?
ANGEL
Touch Cordelia again...
(breaks free of Spike's grip, lifts Spike into the air and throws Spike to the ground)
get ready for our very last rematch."
Their fight in
Destiny showed us that Angel had lost a lot of his desire to be human again. Going back to
Hell Bound:
"
ANGEL
I never escaped from hell. All I got was a short reprieve. Not even sure how I managed that.
SPIKE
Oh, put your martyr away, Mahatma. Fred told me all about your great, shining prophecy. Pile up all your good deeds and get the big brass ring handed to you like everything else.
ANGEL
(turns to face Spike)
Except for one small catch. The prophecy's a bunch of bull. They all are. Nothing's written in stone or fated to happen, Spike. You save the world, you end up running an evil law firm.
SPIKE
Or playin' Casper with one foot in the fryer.
ANGEL
(walks close around Spike, whispering in his ear)
You think any of it matters? The things we did? The lives we destroyed. That's all that's ever gonna count. So, yeah, surprise. You're going to hell. We both are.
(sits on couch)
SPIKE
Then why even bother?
(scoffs)
Try to do the right thing, make a difference...
ANGEL
What else are we gonna do?
SPIKE
So that's it, then. I really am going to burn.
ANGEL
Welcome to the club."
Angel was just going through the motions for a lot of season 5. He wanted the cup because Spike wanted it more than he wanted for himself. If Angel felt the way he did in
Destiny the way he did back in
Judgment the fight would have lasted about as long as all the other fights throughout the series.
The events of season 4 (losing Connor and Cordy) messed Angel up real bad. It's probably why you think Angel is so much stronger at the end of season 5. I think it's because Cordy brought back the Angel we knew throughout the show, it's not that Angel got stronger than Spike and everyone randomly in the last two episodes, it's that Angel went back to normal when he received the vision from Cordy. He regained his sense of self and re-found his purpose in life.