The way I read the card, it is just one EC in battle.
Type: Hero Enh. • Brigade: Purple • Ability: * / * • Class: None • Special Ability: Hero gains (*/*) to bring Hero to equal abilities (*/*) with Evil Character at this point in the battle. Hero gains first strike ability. • Errata: (Treat the first sentence of the special ability as an identifier.)
There is no plural, nor a mention of "all abilities", so it should only be able to use one EC's abilities at that point in battle, not the entire banding chain. That's how I read it.