Emperor Revan
Most Powerful Sith Lord
Grievous isn't completely a droid, that characteristic just makes him more deadly. Look at IG-88 and HK-47, they're extremely deadly while having no lightsabers, lightsaber training, and they're complete droids.
I never said he wasn't second most powerful.
I don't think there was ex-jedi council members to choose from.
Who said they sent Jedi after him? It's more likely he found them and killed them.
Again, Bandon IS second strongest but that doesn't mean he's close to Malak's power.
Emphasis on the word CHANCE, I truly doubt Bandon could've controlled the Star Forge.
I don't know if the masters were as strong as ROTS Council members, maybe the average master but they would be close. I really don't think Bandon is much ahead of them. He would've been stronger than Uthar, then he got less than a year of training from Malak (who would also be focused on finding Bastila). So all in all I think Bandon is the weakest known Sith lord and only at roughly Kit Fisto's level or slightly higher.
Grievous learns VERY quick. One quick round against Mace and he had developed a strategy to counter Mace's Vaapad. Mace said Obi has the best chance of any living Jedi to beat Grievous. Bandon might fight a little differently, but his double ended blade would be a hinderance here I think. Obi had to jab his lightsaber to stop the twirling blades which would be harder with a double bladed and fighting the four lightsabers would be a lot harder with a double bladed IMO. Even if he retracts one side, than he's at a disadvantage because he's used to fighting with two ends.
Next, Bandon's control of the Force was not all that strong. It was pretty clear he focuses his training on lightsaber combat, and like I said before, the Force didn't help much for the many Jedi Grievous has killed.