i disagree, i always take 3 krox with 28 skinks for a 40 strong horde with full command, in CC therefore the skinks dish out 15 attacks followed by 9 krox attacks, bearing in mind the krox cannot be targeted until so many skinks have gone that krox have to start filling up the front rank, which means 20 skinks need to die before this has to happen, add the units faster movement over saurus and they are 1 powerful unit that shouldn't be underestimated.
The only other thing i'd like to try out would be fielding 6+ krox as a big unit, never tried it but if i had the models i would like to.