Springing Anticutback issue

[Guest SSS909]

Plan A was able to terminate the lump sum benefit provided to its participants (possibly due to the financial conditions of the plan). Plan A is now seeking to merge with Plan B. Since Plan A participants are no longer entitled to a LS benefit, if the two plans were to merge, do you think the merged plan would once again have to offer the LS benefit to the Plan A participants. I say no, because there is no LS benefit offered immediately prior to the merger.