Of all those names, Tuchel would be the best choice for United in my opinion. Unless a new challenger appears, all those other choices sounds terrible and just another stop-gap.I don't think Southgate is the right man for United (or any club looking to compete), but there have been links. It's possible Ratcliffe likes him.
Martinez is probably more qualified but he hasn't been linked or mentioned at all. Southgate, Potter, Tuchel...all have.
The more I think about it, the more I think Tuchel might be the one they go for.
Have a feeling INEOS want an englishman and it will go horribly wrong.