It was just an all-round illogical declaration (and yes, I did think that at the time) - only possible reasoning I could see behind it was Root trying to show that he's more positive than the two captains who have gone before him (so something of a PR exercise, that ultimately went somewhat wrong).
If Root believed that WI could be rolled over again, we didn't need the extra 6 overs of bowling. If Root felt that we needed every over possible to take 10 wickets, then our lead was highly unlikely to be enough to see us still bowling 96 overs later. I accept that it allowed us to have two spells of Broad and Anderson, in the evening and then again in the morning, but we can't rely on these two forever.
It's a relatively moot point. Primarily, we lost because of our bowling and their batting. The lead should have been enough to win the game. Had we not declared and instead last two wickets in two balls to be bowled, I wouldn't have batted an eyelid for the reason just stated. But given that we did have those wickets available to use, I didn't agree with not trying to utilise them. The equation of overs and runs just didn't fit a declaration.
Be interesting if we make any changes for the final test. Nothing to do with losing this test (that would be an extreme and unnecessary reaction), but more in terms of looking ahead to the Ashes. I don't think you can throw someone in for their debut away to Oz (whether that be Crane as a spinner, or a batter at 3). I think you need to try them out in this series first.