Inaccurate?

Dragonmarked Summoner

( Dragonmarked, p. 139)

[General]

Your summoned creatures bear glowing marks, resembling your dragonmark, that help deflect attacks made against them.

Prerequisite

Spell Focus (PH) (Conjuration (Summoning)) , any true dragonmark,

Benefit

Each creature you conjure with any summoning spell gains a deflection bonus to AC based on the strength of your dragonmark.

Dragonmark AC Bonus
Least +1
Lesser +2
Greater or Siberys +3