You are welcome Turbine D.
It's my understanding that RR would like to return to twin spooled engines for their big ones as they have had too many problems with three spools especially 'oil hiding' over the years. Historically, Rolls has had to combat oil system issues with the RB211 / L1011; Trent 500 / A340-500/600’s; Trent 700 / A330; Trent 900 / A380.
RR leads the pack of the three engine manufacturers with in-flight uncontained engine failures. That is not something to be proud of.