Sprint needs to go up past about $2.70 a share within 20 months. It's a leveraged position. You can't lose more than it cost. You have the potential of a huge gain. The Softbank deal is not a done deal. So why lose on commissions and buy the stock now?
If I were you , I would not hold LEAPS with such a long maturity as there is no way of knowing how options will be exchanged. You better off holding the common shares and let them buy you out at predetermined price and exchange the rest.