would have been better to call it a wet crank tbh not floating as thats when theres two cranks 1 attached to the block with caps and 1 rotates around the other carryin the piston assembly .
never seen a (caspian)grooved s2 both shells unless it had an early block , imo race engines etc they all run or most run a wet crank i may be wrong ,or it seems a 3/4 groove, if you think about it its the big ends what always wear very very unusually is it the mains as the big ends get a pounding so to maintain constant oil pressure to them imo is much better.The main disadvantage is that it can make the overall oil pressure less which is something which is addressed with the pump.
My engine runs this set up and ive never done a set of big ends EVER and its had some beatings lol @ 2.3 bar etc lol and a splash of nitrous.
tim