I just want to know if Dragon Commander story has more than 1 ending ? And if so, how many possible endings the story will have?
Before I can become aware of any potential answers, I shall take this opportunity to speculate wildly and say that there probably will be. Yes, they could have one ending, but considering the variety of ways you are apparently able to take over Rivellon (a variety, I admit, that consists mostly of rumours, hints and stuff I probably made up in my head), that one, single ending would have to be an incredibly generic "You became Dragon Emperor! Congratulations!".
Instead, I think a more... segmented... ending might be appropriate, similar to the slides of Fallout and Dragon Age: Origins or, indeed, the ending clips from Overlord or Dynasty Warriors 6: Empires or, perhaps, the voice-over from Alpha Protocol. Short sections dealing with your various decisions over the game welded into your somewhat personalised ending. For example, ending segments could be based on such things as...
Did you forge alliances with other Dragon Knights?
If yes, were you true to them or backstabbed them whenever it was convenient?
Did marry a princess? If yes, which one?
Did you remain loyal to a single princess or did you marry and divorce based on expediency?
Did you obey your princess' every whim or ignore her completely? Or something in between?
Did you try to maintain as much harmony as you could between the various races of Rivellon or did you set out to commit genocide on the elves or something?
If you are allowed to make roleplaying decisions on how you rule your territories, were you a benevolent ruler or did you squeeze the population for every last bit of gold? If you were lenient here and tyrannic there, did you tend to go easy on your imp subjects, but oppress the subjugated elves with an iron fist?
And so on and so forth, ultimately ending with, of course, "You became Dragon Emperor! Congratulations!"