The manager has said for a couple of weeks now that Guthrie is carrying a knock and the club are 'managing' it, hence the substitution against Wycombe. I assumed that he was brought off on Saturday to introduce more pace into the side for the second half, which Zooms (and Kiwomya) certainly did. I would rather see Guthrie at CH, but the manager clearly reckons he is a better defender than Bakayogo (hard to argue with that opinion) and we are better defensively with Nugent rather than Zooms (easier to argue with!).
I also think Garratt has looked less than safe all season (maybe even better recently); however, I share your concern that 2 of our more consistent players may leave in the summer, one of them for no fee.