User blog comment:B214/Volume 23 discussion blog/@comment-201.215.165.7-20170616232625/@comment-31137559-20170617030611

The strength of a Longinus depends on the one using it. A powerful weapon means nothing in the hands of a movice. I'm talking about the strength of the Longinus itself due to their stats and abilities. Not how well the possessor uses it. And plus Telos Karma was already one of the known Longinus when the series began and already had a rank among the 13 Longinus. You can't compare an already known Longinus like Telos Karma to an entirely new Longinus that has recently developed.

And it was stated that Georg had intentionally weakened the barrier restraining Asia.

And it never said that the phone Tiamat was holding was a Longinus. Just stated that it was related to a Longinus. And as you know Longinus have the power to kill gods. So an object related to a Longinus would even give Shiva chills. And my guess is that the 'hame' Ajuka is so fixed on that he asked Issei to play through a mobile phone was related to that Longinus. And when Rias and the others went to see Ajuka and in the lobby, there were people with mobile phones which could read power levels which I speculate were related to that Longinus. Those phones are all interconnected and are all related to that Longinus.