DBGT is official but it isn't canon,akira toriyama never wrote anything in GT,he is the one who came up with the idea of spirit bomb and Ki attacks so he's the only one who can decide whether or not it is possible to corrupt a spirit ball.You mean DragonBallGT didn't have a manga behind it, however it is official as Akira Toriyama did work on some of & let it go.
So sorry DragonBallGT is official.
And I think corrupting a spirit ball is very plausible.
Whatever toei wrote is like fan-fiction&non-canon much like most of the movies.