It's actually not clear that $500,000 investment in CoinLab by Draper Associates and others intersects with Bitcoinica in any way. In fact, there's a post somewhere (I'll try to find it) which says that Bitcoinica approached CoinLab for help after the Linode hack and they were unable to assist, which suggests that the investment group which is the limited partner in Bitcoinica is another group for which Tihan finds investments (this isn't at all uncommon in the world of VC).
I think this is the post you are referring to:
Consider that it 2 months of legal negotiation with Bitcoinica as to our role we would be taking, and when the hack happened, we we still completing the ownership transfer:
20:42 tihan isn't like an employee
20:43 he's a middleman
20:43 a finder
20:43 im guessing this huge mess is why he wont be working with him anymore
20:45 however you dealt more with tihan, so you know more about everything
20:46 i really haven't followed the events, nor read much of the email exchange between donald and tihan
20:48 afaict this is effectively a series of decisions that were made in good faith which were unfortunately poorly thought out
20:48 wendon bought bitcoinica in like october and knew immediately that there were problems
20:48 they went to the coinlabs people but they weren't able to help or reneged on the deal or something i dont know the specifics
20:49 when we got involved in what was it like march? they had been operating for months without a major overhaul
20:50 the paperwork was wrong and tihan was rushing because i think he realized how fucked the situation really was
20:50 then at the worst possible moment the hack happened
The email address I have for Tihan mentions splashlab.com - so this could possibly be related to the fund (I am merely speculating here)
Also Bitcoinica Consultancy suggested that there are more than one Limited Partners. Stating Tihan's fund as the 'Majority Limited Partner'. See:
https://bitcointalk.org/index.php?topic=81045.msg902253#msg902253Bitcoinica LP is a New Zealand Limited Partnership which is wholly operated by Bitcoinica Consultancy LTD a New Zealand registered company.
Mr. Heaslip is an accounting professional who assisted us with registrations and company formation. He has his own business interests in New Zealand which are otherwise unrelated.
The majority limited partner in Bitcoinica Limited Partnership is an investment fund which specializes in technology start-up investments. Mr. Seale is a facilitator for this fund and was instrumental in bringing investment into Bitcoinica LP to support it's operation and growth. He has also helped bring investment to CoinLab and other bitcoin businesses. CoinLab and Bitcoinica are otherwise unrelated. Additionally, Mr. Seale is an advisor or investor with dozens of companies outside the bitcoin space. Bitcoinica LP and those companies are also unrelated.