I think people often lose sight of the fact that finger-spin and wrist-spin are different disciplines. The wrist-spinner will usually be the 'riskier' selection. I applaud England for taking Parkinson on tour, but understand why Bess might get the nod in current circumstances.
I think whilst its a bowling position that is likely to change we, or England, want someone who can hold a bat.
That was Mo when in form and to be fair got us out of the brown stuff a few times, could be Woakes if we needed a seamer. Bess is a capable batsmen and maybe why he has gone ahead of Leach(who is handy defending with the bat)
Im afraid the lack of first innings runs over the last 3 years means we need the middle and lower order to get a score(again)
Could be wrong thats how i think they are looking at it.