@antohan great post there.
I'm not sure with the exclusion of Didi there tho. He was pretty good in 54', already won the state championship and Campeonato Carioca with Botafogo and established Brazil player for more than half a decade.
On the back of that WC as well in 1958 he should IMO be top 10 based on his total work.
Apart from that Kubala is certainly top 10 for me. In the 50's it was all about Di Stefano and Kubala in Spain and probably were the hottest topic in club football with the emergence of both sides as prominent ones in European football.
Kopa is a definite must in the top 10 - regular Ballon D'or nominee and winner in 58.
To me the top 10 isn't much different to what
@Moby posted:
1. Alfredo Di Stefano
2. Ferenc Puskas
3. Zizinho
4. Ladislao Kubala
5. Sandor Kocsis
6. Guiseppe Meazza
7. Raymond Kopa
8. Josef Bican
9. Jose Manuel Moreno
10. Juan Alberto Schiaffino
with Liedholm narrowly missing out.