I think youll do well as long as you jump plenty along the way and dont get fat. Ive never seen a true lbm gain be detrimental to athleticism in the event the athlete didnt stop running/ jumping/ playing their sport at a high frequency.
Think about this, grab a 5lb piece of steak and take note of the space it takes up and density. Now imagine that on your glutes and hamstrings, and keep in mind thats ONLY 5 lbs of meat... The amount of lean tissue you can likely build, that is contractile, and HELPS you move, will not hurt you. fat that is not contractile will.
People look at elite sprinters and high jumpers and correlate their weight with performance, only they dont note the bone structure. Many of those guys have insanely light frames, and even though they appear "thinish" they often have quite a bit of muscle relative to the bone structure, especially in the right places.