Dorset Seagull
Once Dolphin, Now Seagull
Presumably one of the '2' in a 4-2-3-1, or one of the 'Central 2 of 4' in a 3-4-3.
Which would seem to be 1 of Pröpper or Stephens.
Or possibly a defensive and attacking MC against weaker clubs and 2 defensive MCs against strong clubs