With the Jain Global tie-up, Izzy Englander's Millennium proves it is in a league of its own Izzy Englander's firm has become one of the industry's most important allocators. Ronda Churchill/Bloomberg Izzy Englander's Millennium has evolved into one of the industry's most important allocators. The firm's planned deal to bring Jain Global under its umbrella is the latest example. Millennium, which sold a stake of itself last year, has become more institutional than ever. Millennium — the biggest hedge fund employer and one of the biggest backers of new funds — is increasingly in a category of its own. The manager, founded and still run by Izzy Englander, invests more than $84 billion across hundreds of investing teams.…