User blog comment:B214/Question and Answers 6/@comment-187.180.176.223-20190619153726/@comment-10330822-20190710061034

I don't see what Lelouch has to do with this.

Like I said, Zekram doesn't care what the Gremory do. But that is how it would work. He approves of Issei's strength, but its pretty clear he only cares about what Issei can do for his clan, not because he seeks Issei's success like Sirzechs does.

Remember, of the 72 Pillars, only a fraction remain from the war, and of those who remain, some were thrown out because of the mixed-heritage. Sairaorg's peerage is made of such individuals. If Rias marries Issei and has his children, they'd be seen as mixed-blood, that's a fact. If you displace the purebloods in the clan enough by having them behind the mixed-bloods in inheritance, Gremory loses their station. That isn't an assumption, that is literally what happened to that fraction of the 72 Pillars. On a side note, if events happen like EX, then there's no need to worry anyway, because Rias will eventually name Millicas her successor over Ex, her son, which means that the risk of Gremory losing their title because of her marriage to Issei is non-existant. All the pressure is on Millicas alone, to need to continue the blood purity while Rias and her family just because a side branch. This option is implied as well when Zeoticus mulled to Lord Phenex that he was "too greedy" to marry Rias to another pureblood when he already has a pureblood grandson.

Zekram said that the Bael Clan has the highest purity, which is why it is the most valued, even though the Maou are purebloods, who purity is "lesser", hence why the Bael are superior to the Satans on societal terms.

You are right that the Great Kings of Bael carry their heritage from the war, hence their titles, but Zekram stated that was because their purity is so high. If you don't believe me, review the material.

Where are you getting your reference material, because it seems incomplete? Everything I've said is stated is referenced in the material and you can even read it on Zekram page on the Wikia.

Are you just misinterpreting the material? Because I don't understand where your confusion is coming frmo.