And the BB items no longer drop from the KS99's themselves now
Wrong wrong wrong! I have seen this said and it's apalling that people would spread this false information.
I just did The Hills Are Alive KSNM 99 last week. The alliance I was in defeated this KSNM 15 times. Out of those 15 runs we got 4 Adamantoise Eggs. Blue Pondweed (the pop item for Adamantoise) drops 100% of the time.
If you want to get the Adamantoise Egg, you can try your luck with the KSNM 99 fight. If you don't get it, you can use your blue pondweed to pop Adamantoise. Killing him will get you a red pondweed which you can then use to spawn Aspidochelone. Aspidochelone can drop an Adamantoise Egg but I don't know the drop rate for that.
Depending on your situation, you may be able to go about this differently. If you have friends that are willing to use their Kindred Seals for you, then perhaps you can eventually get an egg from the KSNM.
Also, you can bazaar your blue pondweed if you want. I sold mine on the Sylph server for 500k because I was lucky enough to get an Adamantoise Egg on my 2nd attempt.