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Well, I'm just using information on butterfly's website, so there was a time he was using t05 hard on FH and d05 on the BH, and pro players have already got access to d05 for quite a long time, so I wouldn't be surprised he was using it for quite a while before switching to d09c. And even if he switch his FH, it doesn't contradict the comparison between t05, t05 hard, and d05, since he chose to keep t05 hard as FH and changed BH, and now there's a better one for his FH so he switched his FH and kept d05 as BH. Also you are saying tenergy 09c and dignics 09c , did you mistype one?
I'm saying it's a volatile situation - pros switch, it's hard to know why they do that, and even if we do know it's hard to say how much their reasoning applies to amateurs like ourselves. We can pick on Boll's specific case, or we could take Kenta (who is listed as D05 both sides), or back to Harimoto (D05/T05), and then Ueda (D05/D05). I don't know how we can just look at Boll's (or anyone's) play and work out what the differences between rubbers are - it's just not clear enough IMO.
For Boll, Butterfly say D05 and T05Hard, as of 1st Feb 2019 (telling that there's been no update since then). He's been spotted using T09C on FH in recent weeks. D09C has just appeared on the LARC, and I make no suggestion that he's using it (but it's an interesting thing to appear, no?)