Insulin is the most anabolic hormone. It shuttles available glucose and amino acids into myocytes to expedite recovery and hypertrophy. It can also shuttle glucose into adipocytes to be stored as triglycerides which increase adipose tissue/fat gain. The latter is mitigated given adequate training and androgens, and assuming the caloric surplus is not unreasonably large. Skeletal muscle fiber damage from training + androgens/non-insulin anabolics + insulin + excess glucose and amino acids in the blood = the milieu for partitioning towards muscular hypertrophy.