"Developer" implies a company that makes there games entirely for one console manufacturer. If it were something like Mass Effect, the developer wouldn't be going multiplatform, given BioWare has already made games on multiple platforms.
The number of independent developers tied to one platform holder are few and far between. Sony has bought up everyone of note in their camp over the last few years save Insomniac, and there aren't that many working with Microsoft and Nintendo.













