Di'Anno? Uh, no thank you.
Di'Anno had his heyday. That was a LOOOOONG time ago. Besides, it isn't like he has special talents that will help out 'Thrax. They've had an excellent singer in Bush. They've had a below average singer in Belladona (who did his best work way back on Spreading the Disease). Either way, they've put out good music. They don't need Di'Anno's vocals, and I don't think he has 'star power' to get them noticed.
Steve in Philly