In terms of quality arguments I've seen here there are quite a few players in contention for 5th overall:
Goalies
Hasek - if you highly value high regular season peak and do not value Roy's adjusted RS stats
Roy - if you highly value playoff peak and do not value RS peak
Plante - if you value winning above all and respect his insane longevity (though not prime longevity)
Defenseman
Harvey - if you think he stirred the drink of the 50s Habs and his high prime
Bourque- best prime longevity in the sport besides Howe and nearly won a Hart
Lidstrom- longevity, prime, success. Really everything except a high peak
Shore- if you read too much into his Hart trophies he has a Big Four peak
Forward
Beliveau- high peak, long prime, won everything. His lack of RS awards is likely what stops him being the consensus 5th
Hull - arguably the highest offensive peak outside the Big Four
Crosby- arguably the best player born between 1973 and 1997, high peak, still in his prime, best trophy case of anyone post Lemieux
Richard - playoff warrior, 50 in 50, most culturally important hockey player of all time
Morenz - high peak, died from hockey injury, considered the best player pre 1950
Jagr - 5 Art Rosses, high peak, elite seasons 15 years apart, and still playing in his late 40s
If I take an honest look, I don't think everyone has a good case for 5th.
Beliveau and Hull are definitely the favorites, with Crosby, Hasek/Roy, Richard, and Harvey having great arguments too.