I think that Webby has become very indecisive on defence and this is not the first time he has been exposed.
Remember when Whiting broke away in the QF ( when he had no-one in support ) and Webb just backed away and eventually fell on his backside ?

Although Danny McGuire saved Webb's blushes with a cover tackle, Hull scored off the next play.

Webb seems incapable of taking the initiative when facing an oncoming player and a clever footballer such as Chase will take full advantage.

Webb probably could have taken Chase out, but Clarkson's poor miss allowed the whole thing to unfold. Even if Webb had got Chase, we'd have been in defence on our own line. If Clarkson had made the tackle we'd have been defending 70M out.

Slightly OT, I know everyone's creaming about Charnley, but am I the only one who thought his attempt to beat Wellens after making a long break was, well, a bit naff? He had acres of space in which to commit Wellens, and yet only swerved a little way too close to him. Wellens is a sound defender, but has nowhere near the speed of Webb. IMO Charnley could and should have scored. Plenty of class wingers I've seen would have been in under the sticks from that position.

I did mention the moving of BJB to full back and did see the way he did not round McGoldrick, but I also saw him take a few high balls in our 20 and make incisive runs, beating numerous men on the way, getting us on the front foot early in a set. Webb has failed to do this regularly and I feel BJB has the pace to do this regularly.
As for the (none) tackle on Chase, I watched it again last night and still feel he had to implement a tackle. Yes Clarkson left the hole, but full back is an important defensive position, where one up tackles have to be made combined with good decision making. Webb did not, in my opinion, make the correct decision.
I'd rather have another chance defending my line than be under posts waiting for a kick to come.

Spot on, and we have to give credit to Rangi Chase for an excellent step, and scoring one of the best tries of the competition.

That's spot on. There is a bracket of time where the support runner is covered and Webb could easily make the tackle, but he held off. He won't commit to any tackles at all. A neck/back injury isn't an excuse, it's a reason and should be taken in to consideration at contract renewal stage.

For me the blame lies with Clarkson for the Chase try, it was a shocking attempt, I can't make my mind up abouth Clarkson, I think he's got potential but he doesn't really hit hard in defense or attack and he seems to have very average hands. Hopefully this will improve as he develops and fills out, but at the moment I'm not sure he should be starting LF for Leeds. Webb has been inconsistant at times this year but he has also been our most creative player at times too, he has an extra dimention to his play that BJB currently doesn't have playing FB.