kabuto is better than him. the only thing hashirama can do is heal injuries. he wasnt stated to be a master of poisons and antidoteshashi is noted to be one of the most powerful in medical ninjutsu in the NV
edo army can beat him down but i guess if hes gonna summon edo army then just kill him,not wait to administer a poisonkabuto would die before he could even get close to Hashirama.