RE: Can you !
No. 2,500kcals/day of sugar will not build any muscle and will kill you due to lack of protein, EFAs, vitamins, minerals etc.
You need to get adequate protein & EFAs. Then ensure that you eat enough carbs pre-WO to fuel the WOs. Then add other foods (ensuring sufficient fibre, vitamins & minerals & other nutrients) to make up the rest of the Calories.