The thing about Bresnan being safe is that he can bowl reliably and then there are a number of bonuses if he plays well. Finn is improving but still gets into a bit of a mess a lot of the time, so from the coach's perspective it's easy to understand why they go with the guy who can usually stick to the plans.
I don't honestly think the talisman concept is any real thing that is talked about at England planning meetings, it's just a phenomenon that can be commented on. Tremlett's and sometimes Broad's fitness has been the main adjunct to Bresnan's Test career.
What strikes me most is that England have such a funny slip cordon; you can't necessarily straight-swap in a guy who can slip because so many of them are bowlers.
What I meant to add, but never did, was that the "safe" option of someone who can bat and bowl isn't necessary with a four man attack, a potential 7-9 of Prior, Broad and Swann, and where the bowling ability should take precedence over the batting ability of the one bowling slot "up for grabs".
I mean if you have a bowling attack of say Imran Khan, Wasim Akram and Abdul Qadir, you're not going to need to pick the 4th and even 5th bowler on batting ability as Wasim and Imran have enough between them already. I had this debate with the captain of our team at uni, I said you've got a load of medium to quick bowlers and plenty of batting, doesn't matter if the leggie is a bit wayward at times, he'll offer something the team doesn't have - spin. But it was deaf ears, he thought he could bowl spin
Sometimes you just need to pick what you don't have, someone who can hold a bat we have two of, likewise two quick bowlers who can move it about and take wickets. If Bresnan were as good as Broad and Anderson he'd be in the side all the time and have their number of caps.
England need to mop up the tail fast, I'm not convinced 350-400 is a winning total, but if England want to win then scoring 500+ and getting the windies out again is going to be more straightforward the less runs the windies manage. And of course if we were to capitulate which isn't unheard of, the less far behind we can be the better.
And both overnight batsmen got out fairly quickly from their overnight scores, don't know why so much is made of Strauss not going on from overnight tons. It's a different day, you have to start again and in bowling conditions most likely to be helping the bowlers as at any time of the day - and the bowlers are fresh.