Few points here Brum. Firstly, we do have at least one wide player - Burke. In my view the best alternative system is a 4-2-3-1 formation. The three behind the one striker could be Burke on the right, Didzy in the middle and Fleck on the left. McBurnie up top most likely. I could see that working.
As for the lack of cover, don't want to be rude but did you not hear Wilder's desperate pleas to the board to sign a replacement for O'Connell in the last few weeks of the summer? If you're saying that before that we should have signed someone then we already had Robinson. Many will say he's not good enough, but for odd games he is, if he is is injured for months then no, but to sign someone who can cover O'Connell and be of a similar standard would be harder than you think to get and they'd be sat on the bench every week like Bogle is now, but he's one for the future and then you get fans saying we need people in now that are good enough but they want decent wages - see Cash and Robinson as key examples. I've said this countless times, but bringing in players that are good enough on our wage structure is not easy. What's scewed us over, other than injuries is the lack of form to key players that previously we relied upon. I've also said this a few times in the last day but I think it's worth repeating.
I do wonder if our fans think that Wilder wanted Lowe for example as his first or second choice. I would guess he was about 3rd or 4th choice, and was only bought in as back up but because he is young he can improve and he's had to play far more than desired because we've had injuries to Stevens and O'Connell.
On wide men cover, why would Wilder bring in wide players for cover to change a system when they wouldn't be used? As you say, we've done really well with this system, why look to change it in the summer.
One thing not mentioned much is the problem if transfer windows. If you get injuries just after the window closes or just before it closes (O'Connell) you need more players due to lack of form, whatever reason, then you're screwed until January and this suits the bigger clubs with much more quality throughout their squad. To go back to your first point on cover if we didn't have transfer windows we could go with a smaller squad and not need to spend millions on back-up players because we could bring in players on a needs basis, rather than for cover. Why the existing transfer window system is in place is beynd me, it only makes it easier for the bugger clubs.
Finally, Ampadu is the defensive cover for Egan and Bash, Stevens can fill in also at left centre back. Even at the better teams they don't have an equivlant player of quality for every position, its just that their back ups are better than most of our first choice players!