Zoah

Hi there. A friend of mine were wondering if the following was valid due to us disagreeing on the wording around affiliation. Would Malkieth, Enchantress, Skurge and Heimdall be a valid 17t squad? I think they would be as three models have the cabal keyword. However he feels they would not as three characters also have the Asgard keyword and it states that half your squad must from only one faction. Ay clarity on this would be great thanks!