Depends on the Blacklist Hunter. Most of the ones we know are clearly not at this level, the strongest we know is Saiyu and he probably doesn't care, you need to find them too. Bushidora was a Single Star Blacklist Hunter and lost to Hisoka offscreen, Hisoka was not even injuried and had to kill several other Hunters too.
Yeah, i think we are reminded rather often indirectly that a star does not correlate with fighting strength all that much.
Tsezguerra is definitely stronger than he seemed on GI, but even in top state he is most definitely not on hisoka's level.
Bushidora might aswell have a star because he was very good at coordinating strikes against an influential crime synicate rather than for bringing down a dangerous criminal himself.
After all (and this is kinda interesting): The spiders are a MUCH smaller threat to the order of the hunter world than people like jairo.
The spiders are very strong individually, but they steal and run. Their big feat was taking out a lot of paramilitary mafia people and assassins, but you can come by the spider with other possibilities. Should they ever threaten an influential politician, you can definitely hire top notch military officials to bring them down.
Afte rall, in the latest arc we see that the military has quite top level nenusers in it, and i am sure political officials (since they know about the hunter org) have access to enough firepower necessary.
The thing is that the spider do not warrant to bring out the big guns because they only seem to meddle with some rich but unimportant people and the mafia.
Those people can hire the zoldyeks and other assassins, but they don't have quite the warmachine behind them.
Jairo on the other hand is an actual threat to the world order by leading a drug cartell and being able to control his own region. He can definitely use means like sleeper cells and stuff like that to do a lot of harm, even if jairo was (before converting) not physically strong.
If Bushidora took out such a cartel, then his star is more than justified even if his fighting prowess does not justify a star.
After this thought: Blacklist hunters might not be the strongest hunters arround.
I would give that edge to any martial artists of either huntingtype.
Biscuit has no fighting hatsu and she is interested in gems, not fighting.
But since she practioned shingen kungfu, she is one hell of a powerhouse.
I would exspect anyone who actually does martial arts and is a hunter to be on the stronger side.
Even people like Wing who do not seem like much can probably be a good match for many blacklist hunters.