Hall was named 2nd Team All Star for the 55-56 season, which suggests that he played well, but as you pointed out the Wings had a large drop in points. Is there an explanation for this? Was there some other factor? Maybe since it was Hall's first season as a starter he had an adjustment period in the beginning of the season, but was strong in the second half? Just throwing out guesses...
sawchuk was also 2nd AS in '54 and '55, after harry lumley. at the 1/2 mark of '57, sawchuk was the leader in AS voting, but then retired due to "nerves." his numbers seem to have been fairly mediocre until increasing again in mid '60s.
interesting, though, is that sawchuk was 2nd AS in '59, when DRW were the worst team.
from hockeydb.com:
'55 sawchuk: .926, 1.94 -- (25.58 shots against per game)
'56 hall: .922, 2.10 ------- (26.81 shots against per game)
someone may know shots for numbers to give us an idea of possession.
'55 DRW: 204 GF, 134 GA ---- +70
'56 DRW: 183 GF, 148 GA ---- +35
'56 DRW lost some depth. leswick, skov, bonin, johnny wilson, woit and stasiuk were traded after '55, and their replacements played and scored much less. top players generally scored more in '56, but DRW had only 7 players with 10+ goals in '56 compared to 11 players in '55.
........
probably also important is '56 habs, who totally dominated the season, and could be argued as the best team of all time. '56 DRW had to play them 14 times (4-8-2 record vs habs).
nature of a 6 team league, playing each opponent 14 times, could have a fairly large effect on a goalies' numbers.
peak/prime sawchuk not only played behind the best team, but also did not have to play against them 14 times. same could be said of plante with habs.
both early '50s DRW and beliveau/harvey habs were great defensive teams who were also setting new standards in the transition game and in offense (including offense from d-men).
that effect would be even bigger in the 4 team league of the early NHL.