If T5 is going to have jump masking, it would IMO be an amazingly good idea if Mongoose didn't publish any any material about the Third Imperium setting that contradicted the existence of jump masking. Other people's milage may vary. I'm just expressing my personal opinion.Marc's decision is obvious in T5: only a body equal to or larger than the ship can kick it out. ANY body equal or bigger can do so.
Hans