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It's the forward thinking that's at question here. D&G as interim managers because they were unable to find an alternative mid-way through the season is fine, but with them in place it meant the club had enough time to look at viable alternatives. If D&G succeeded, great, but if they didn't (which I think we can safely assume they haven't) then the club should've had a list of successors lined up, with conversations to take over at the end of the season already underway. What appears to have happened is they club waited to see how D&G did, they didn't meet their expectations, so the club began the search for a replacement.
The situation reeks of poor management.
I disagree it is poor management. I think it is consistent with Rob Morrison's conservative approach to business management. We may disagree with Morrison's approach but it is actually logical "within itself".
As for the potential successors that you speak of, these coaches were or were not available at the time Ernie resigned, but in either case they were not appointed even if they existed and were willing to come on board. Consequently, no good quality coach will wait another half a season to see if they are still needed if the Option #1 (D&G) does not work out for Welnix. They might wait, but they would have asked Welnix for something in writing and for some money to change hands, otherwise they would simply find another job elsewhere in the meantime, and not wait to hear from Welnix. Much like Moss did.