Silva's volume may now be soft and in slow-mo. So Jake could still be confident that Silva is not anymore the dangerous spider the moment they'll face each other inside the ring.
Aside from that, the gloves used in MMA are lighter and less padded so the strike or punches in MMA is far more devastating than punches in boxing having the gloves are heavier and more padded than in MMA which nullifies some power from the striking force. So definitely, Jake will be receiving a less powerful strike due to the gloves difference + aging factor. That is also another reason why most MMA (if not familiar with boxing gloves) got tired easily in boxing due to the weight of the gloves.