Why would Tyrant think that it would have been necessary to bombard Thanos with TP assaults? I got the distinct impression that it was Thanos that needed all of the help that he could get, and not the other way around.
I don't need to provide a scan this is a forum battle, and as such if you look at Galactus' bio it states that he has enormous TP powers, thus in a forum battle they would be fighting without CIS, if so Galactus would be able to employ this sort of an attack, which would also be insufficient to defeat Tyrant.
Do you want to know, what else is black and white? The fact that you don't seem to get one small thing. Galactus and Tyrant have fought off panel in the past, and Galactus and Tyrant left universal destruction in their wake after the battle had ended (according to the writers of Marvel). Now let's translate that evidence to a forum battle, and you will begin to see that if CIS is off, Tyrant would be able to resist a being of Galactus' stature, because he was able to do so in an off panel battle. This would make Tyrant what? Skyfather level? No.
If Galactus is an Abstract Tyrant is as well, as is the Stranger. On panel it was stated that when Galactus created Tyrant, that he created him nearly as powerful as he is.