In fact, Tesla's biggest green flag may also be its biggest red flag. One green flag: Elon Musk is becoming more realisticFor years, one of Tesla's biggest criticisms has been its ambitious timelines. Day's Range $ 326.15 - $ 332.05 52wk Range $ 297.38 - $ 498.83 Volume 10.4M Avg Vol 45.6M Gross Margin 18.85%One red flag: Tesla's biggest investment cycle is just beginningIronically, the same comments also highlight Tesla's biggest risk. That's both the company's biggest green flag and its biggest red flag. The red flag is that execution will require enormous amounts of capital, patience, and flawless operational discipline.