My 2 cents is that Lanemasters does not truly have a "benchmark" ball perse, since they discontinued the Absolute Power. It could handle medium oil (for me anyway). No other Lm/L ball, without surface and drill mods, can handle true medium oil with an arc-ing ball path for the average bowler, allowing one to properly gauge the need or requirement for the proper ball for that oil pattern/lane surface combination.
The proper ball would be a combination of the Buzz, the Sting, the World Class Reactive, the Masterpiece, the Satisfaxion, and the Big Kahuna, in my opinion. It's almost always a lightly polished medium rg, medium flare solid resin. In Lanemasters case, it could very well be a particle solid: a combo of the Kong and the Sting.
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"None are so blind as those who will not see."