I noticed the new erratum for EIR Centurions on the Swordpoint web site. It currently reads:
"A Centurion is A+2, C+1 and costs 15 points. It is a Legate, rather than a Centurion, which can only command legionary units."
IMHO the original list of commanders is perfectly fine. During the Republican and Imperial periods, Roman centurions were integral to their own maniples/cohorts, while a legate commanded at least one entire legion. Legates also commanded auxiliary troops. For historical accuracy, I would only change the line about Centurions to something like:
"A Centurion may only command a legionary unit, to which he remains attached at all times."
Just my two sestertii's worth!