Yep, this has been a topic here before...no real resolution. You didn't really need to prove the case, it has already been proven.
No. From a post I made to this list on 6/22/2000:
++> Here's the deal. If you number out of Provider1's CIDR block ++> but advertise your more-specific to Provider2 and the two Providers ++> touch and Provider1 accepts the more-specific route from Provider2, ++> you should have no problem reaching anyone. ++> ++> Here's the reason: Everyone accepts Provider1's announcement of the block. ++> When your link to P1 is up, any traffic they recieve for your prefix ++> gets routed over that link since they carry your more-specific internally. ++> However, if other providers here the more-specific from P2, they'll ++> send directly via P2 who sends it over the link to you.
But if your chunk of space is greater than /20, the other providers will filter P2's announcement of your space and you are back to square one. Well, at least you won't be cut off from the entire Internet, I guess that's something. Square 1.5. Austin