Who caused more damage in the Pandava army between Karna, Ashwatthamma, Dronacharya, Bhishma and Bhagadatta?

Who caused more damage in the Pandava army between Karna, Ashwatthamma, Dronacharya, Bhishma and Bhagadatta? Ashwathama killed maximum number of soldiers. He squashed 1 Akshouhini of Rakshasa soldiers conjured by Ghatotkacha on 14th night. On 15th day he caused massive carnage amongst Pandavas with Narayanastra and supreme Agneyastra. His Agneyastra was countered by boon of Shiva to Krishna, else it would've burnt whole pandava army to crisp. Still it eliminated 1 Akshouhini of soldiers. Not to forget his carnage in 18th night where he eliminated remaining Pandava warriors. All in all he killed almost 3 akshouhinis, or more if you consider Ghatotkacha’s soldiers. Followed by him is his Drona, who slaughtered more than 2 akshouhinis. He killed maximum number of elite warriors. And third position goes to Karna who slew almost 1.5 akshouhinis. He was best/second best warrior in Kaurava's in terms of dealing with group assaults. Next would be Bhishma. Bhishma’s kill count is less than a single akshouhini. He is said to have killed 10k soldiers per day which adds upto 1 lakh. Also, he didn't killed any significant warriors except for Virata’s eldest son Shweta. Bhagadatta would be last, he was a menace on 8th day and 12th day thrashing warriors like Bhima, Ghatotkacha and Abhimanyu effortlessly. But he doesn't seemed to have killed much soldiers. D