Would hold off on tesa until much closer to target weight. High protein and steady gym work should cover muscle retention in the meantime. Bringing tesa in later makes the final stage more efficient and cheaper. Other choices exist and it comes down to what feels right personally and how much risk someone accepts. A SARM such as ostarine is another route some take for muscle, though it requires watching liver values and hormones. Glad the plan is to test reta by itself first before layering more things.
Stats show 54M and reta arriving soon. Plan is to use it solo for the first month to adjust, then consider adding something to speed results. Goal is fat loss while holding muscle. Height 6'5", current weight 255, target 225. Gym three or four times weekly plus planned road cycling of 75-125 miles once weather allows, mixing zones. Diet is being improved with more protein and less processed food. Looking at three possible additions after the solo period.