Yeah, you're pulling this out of your ass
LeBron on: Cavs' Net RTG = +11.7
LeBron on, Kyrie off: Cavs' Net RTG = +14.3 - LeBron scored 27.8 points per 36 minutes on a 58.2 TS%
LeBron on, Love off: Cavs' Net RTG = +10.3 - LeBron scored 29.4 points per 36 minutes on a 57.5 TS%
LeBron on, Kyrie and Love both off: Cavs' Net RTG = +10.0 - LeBron scored 31.4 points per 36 minutes on a 57.9 TS%
LeBron off: Cavs' Net RTG = -5.3
As long as LeBron is on the court, Cavs are an elite team. And unless you consider scoring 30+ points per 36 minutes on great efficiency while leading your team to a double digit positive net rating, your "LeBron struggled mightily without Irving and Love" statement is complete bull .