Yes what you are saying is totally true about what drummers use "officialy" live etc.
He used Sonor with The Cult in the late 1980s. You might just be able to see the Sonor logo on one of his rack toms below.
I'm pretty sure when he left The Cult he changed to Yamaha straightaway.
I agree with you about hearing the Yamaha tones in the drums of the albums, his drums sounded the same live when he played with the Yamaha Rock Tour Custom. Which leads me again to say he did use the Yamaha on the recordings, just my opinion though!