He's already made his intention known that he wants to acquire 40% of the Company, he's happy to accumulate
as the price drops. When he's filled his boat and has the power he wants he'll make the necessary changes. He's also a major holder of automotive related companies, FDML,NAV & perhaps others; there could be cross business opportunities between those and HTZ.
what the stock does in the short term. He owns positions in other auto related companies, and by being on the Board he can influence business decisions which will help his other holdings. Warren Buffet operates the same way, their ownership in a Company is not always what it appears to be there can be ulterior motives.