youralltrolls
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That manga page states Orochimaru had a perfect Edo Tensei thus the 1st and 2nd are able to use their abilities. It even says on that page even though the person follows all of the summoners orders, it can use all of his original abilities.
Just because Kishi added more abilities to Hashirama and Tobirama later on in the series, does not disregard Hiruzens battle with them. According to the information we have on edo tensei, we have seen that even if they are mindless drones they can use their full powers.
Nagato is an example.
That ninja who if you block his kunai your body becomes magnetic.
Zabuza and Haku.
Seven swordsmen.
The list can go on and on.