I just killed Troy yet again, and it suddenly dawned on me;
The ECHO device that Typhon communicates with the vault hunters with must have been dropped by Troy.
Which means Typhon had much closer contact with his children that I had assumed. If his first thought after feeling the effects fo the Great Vault opening was to dial up Troy, then he had to know it was still a valid, um, number.
So, was Typhon tracking his children regularly?
Had he knowledge of the CoV they had set up?
Did he feel the other vaults opening?
My realization that that ECHO came from Troy changes stuff…