Silicone filling a crank does not make more power. It is drilling out the crank and making it lighter and then filled back in with lighter silicone. Tungsten on the counterweight does add some weight but helps smooth out the engines vibrations at high rpm.
Ceramic rear bearing is better and lighter.

All these things help the Lrp/Speed but the biggest factor is the Lrp has way more crank timing. A much bigger reason than all the stuff listed above.

Rex