Since reporting its results for the third quarter, shares of footwear brand Crocs (CROX) have been on a downward spiral. Disappointed by the ongoing weakness of its HEYDUDE brand, investors have been on a selling spree of the stock. After a 19% plunge on Oct. 29, the stock is now down by 27.6% over the past month, and has pulled back by nearly 38% from the two-year high set in June. However, at least one company insider seems to think that now is an opportune time to load up on the company’s stock, making his biggest purchase of CROX shares so far this year. Should you follow suit and buy the …