If all you are doing is jumping around with barrier, he will hit you before you hit him, so yes, he does gain something from that. That's an oversimplification of what I was saying. If any character literally jumps around holding barrier they will always lose. Since you and I both know that is never what you do, we can erase that argument completely. Besides, even if that was Rachel's best defensive option, Hazama would gain meter just for slamming on her stupid barrier with chains, over and over.
Hazama's meter gain is pretty phenomenal, yeah. And then his meter use is near infinitely better than Rachel's, on average.
If Rachel forces her way in, what does she gain? If the Hazama is intelligent, he should save 50 meter for jayakou counter, which makes the already questionable pressure Rachel has even more insignificant, as even if she successfully mixes Hazama up 3 or 4 times, he can level the playing field with one IB reversal.
Also, I feel Hazama's pokes are much stronger than Rachel's. Maybe that's just because of the way Bang functions, but Hazama's 5B seems much better and more rewarding than most of Rachel's close range poke options.
And again, smart hotenjin should definitely factor largely. Zakiyama makes Hazama look even with Ragna and Bang with how well he uses his meter on hotenjin alone. The key is not yomi hotenjin, IB hotenjin reaction, so your opponent actually has to successfully yomi YOU to avoid dieing, rather than the reverse.