This is Agatio explanation:
"Better explanation about alt factions and what not:
An Alt faction would be one that has at least 2 members of the leadership from another faction in leadership positions in BOTH factions. AND/OR contains a portion of the character's alts or "main" alts in it greater than 10% of the faction population. Defined as this being when one individual has 2 or more characters and 1 or more character is in each faction. ALSO, should the leadership of the "Main" faction in question reap any benefits from another faction, other than assistance in a TW that the "Main" faction is engaging in, then this faction would be rendered into "Alt" status. Therefore, "Alt" factions could be used to have more player participation in a given TW, but not to run its own TWs."
Every Faction that Is under this requisites will be consider a ALT FACTION.
Ty