The Green Eye's question has already been answered so that line of questioning is complete...
You ask about the dragon motif.... The Summoners horn has been in FF lore for a LOOOOOOONG time. You can say the most human summon in FFIV was Asura, and she rocked a horn while in the battle screen. The Summoner's horn was part of the job lore in FFXI, in FFIX Eiko wore a horn and there was a connection between it and her moogle buddy. So that part is more about the horn than that of a dragon.
As far as the body piece having dragon like aspects. I disagree... I See the wings and tail on the body piece being more reminiscent of Moogles which there have always been a connect between summoners and moogles. The wings are golden moogle wings, which are also short and stumpy like so...
Now the Allagan gear... sure I agree with you. But the AF gear... no way, the horn is FF lore, and the wings are moogle references, and I would assume the Summoner will eventually get a Moogle Companion (not a egi) but a companion exclusive (one that can be cross utilized, like the white mages getting their unicorn)