not sure I understood what you said about the whale buying at 7.50
I am assuming that you are saying that the whale bought the call option with a strike price of 7.50, instead of buying the stock at 7.50, so that he does not drive the price up due to his big buys and in the process pay more than his target price of 7.50.
If he buys huge number of call contracts at 7.50, there are a couple of reasons for him to do so
1) that he expects the price at the time of expiration will be north of 7.50 so that he can buy his shares by exercising the call at 7.50 instead of paying the market price at expiration - say 8 or 9 or even more. That is a win situation for him.
2) that he wants to cover his short; worst case he will exercise his call and buy shares at 7.50, instead of 8 or 9 or even more and cover his short position.
Of course, if the stock does not go beyond 7.50 at anytime or at the time of expiration, then he will lose his premium entirely or partially depending on when he will sell his call option ( some time well before expiration so that there is some time value still inherent in the call)
To break even he will need the stock price to go up and beyond the strike price by the amount of the premium he paid
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