My example in the first comment that you could be really good and have grandmaster rank in Dropshot while still only a gold in standard had nothing to do with how this would boost you up; just that they are vastly different modes with completely different meta and play styles that the only skills that transfer are your ability to control your car.

Given the conditions they detail in which this would happen, it could very well split the difference between such a large rank gap and put your standard mode rank to plat. Even though you might be better off in gold because your skill with the meta and flow isn’t that good.