I'm not entirely convinced of that Jtpsops! You're only plucking 5 off of any given roster! There've been a lot of teams through the years with 5 really useful players, and then a pile of trash is left over! Moreover, you might not even have the best 5 off of any given team, since a $100,000 M salary cap prevents having, say 25 $8M players!
I believe if you can find a team that offers up 3 core players, and 2 more useful parts,...that'd be worth looking at,...because multiplied x5 that gives you 15 core guys, and 10 more useful parts.
That said, I challenge anyone to find 5 guys worth having off of the 1969 Seattle Pilots! BUT,...you can mine some gems in what appears to be desolate landscape a lot of the time!