About Alistair! (Dragon Age: Inquisition)

It is clear that even if he ascended the throne (we analyze this version of events), he did not cease to be a Gray Warden.
And since he is such, why is it nowhere indicated that he heard the call, like all the other Guardians? He couldn’t just get rid of the filth in the blood, or I didn’t read the wiki that way, but everything seems to be right.
What are your assumptions?