Danzo's fuuton was going through complete Susanoo and Gai's Hirudora is way stronger than it.
No, V2 isn't blocking that.
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Using another example to try and prove me wrong when V2 has already tanked something stronger than Hirudora? Unless you think Hirudora>Kirin.
The bold is merely an assumption, not to mention feats dictate that with Baku's suction powering it up, it is (No matter how unbelievable you think it is), as it was able to get past a V3 Susanoo's defenses, while Kirin (Stronger than Hirudora) was blocked by a V2 Susanoo but was obliterated in the process.
V2 Susanoo will take moderate damage, but Itachi can just fix that after the blast. There is no way that Hirudora is getting past Itachi's V2 Susanoo and killing him, to suggest such would be saying Hirudora>Kirin, and that is false.
It traveled over to his location, doesn't make it instant.