please tell me you have a actual source.
WLK
Russ could probably win a drinking contest, but that's about it with Horus. Sanguinius benefited from (suffered?) the fact that they could build him up into this near-perfect, golden Primarch that could have been everything great about the Imperium, because he was born to die at Terra. Horus was the same way as he had the 'best of us' qualities, because he was very obviously on the track to become the very worst of them all. So even if something a decade or two old surfaced saying he sparred well vs the Warmaster, I wouldn't read a single thing into it as Horus and Sanguinius clearly had to be the best of the best just to highlight how horrible the final battle was going to be. Not to take away from any other Primarch or add fuel for some insane A>B=C rankings. They were all awesome in their own ways.
/Dune: The plot must flow.
Back to the book though. Please tell me I wasn't the only one who laughed out loud at the Warden and his 'party bus'? Zipping around a Daemon World on a burned out Mastadon, big bumper sticker that reads 'We Stop For Killin'!', yelling and cheering through the wastes? Paraphrasing, but 'We didn't come to save you, we came to kill them!'
Edit: Although I really enjoyed the book, I have to say the Blood Angels having 'preysight' irked me every time I read it. I don't mind them having that same thermal/electromagnetic vision modes, but the name just didn't seem to mesh with me.