If you wanna focus on corsair i´d say put some
Raider Halberd on and get Casta to Crush them all
Althogh i don´t run a initiative deck with my sothrons i think you should consider
Southron Chieftain and maybe a
New Strength Came Now to get an easy overwhelm with
Castamir and his halberd.
Playing with raiders i learned that it´s a good thing to have some ways to win skirmishes (or even overwhelm a companion) to cause some deaths and make some of your minions stay on the table, cause sometimes only
Rout cannot hold your opponent for a double move if he/she realized that you don´t have much power to kill the companions. The possibility to face
Castamir with is toy or to have a side companion killed by a strenght 9 minion that pumps +6 (with New Strenght or even with Winds That Speed Ships) can make your opponent thinks twice before try some heroic double move.
Persolnaly i think The first event fits much more in your deck cause don´t depend on the tokens (If you put some
Southron Chieftain you can get initiative without it) and can pump your southrons AND your corsairs...
Another Sugeestion is
Black Numenorean. He can make the role of
Castamir being a fierce bad minion and discard possessions instead of Marauder. With
Southron Chieftain and New Strenght Came Now you can make some trouble to your opponent... The bad thing is that he don´t add tokens to your possessions and you don´t exactly choose what possession you will discard, since the freeps could assign him to what he wants...but that´s the trick!
Normally the strongest characters bears some possession... if the freeps assign him to them you can remove 2 or 3 tokens and make all that possessions go strict to discard and if he/she assigns to a companion that have no possessions at all (consequently is more likely to be weak) you can surpise with some pump event and kill! The halberd can ensure the twilight will be there when you needed
Before that, your opponent will have bad times at the assigment phase cause he will never know what you are up to...and that is the fun to play with initiative southrons with events that pumps +6... :hey:
I really like your idea and i´m considering to make some deck like your to play in SdA (caus i don´t have the real cards to build a "real" deck...
)