Edo nagato was stated as stronger pein
Both rasa and muu were said as strong as ever
Tobirama and the other kage have also been said as equally as strong as they once were with contrast to orochimaru's old edos which apparently didt do that
Madara as a edo was directly said as stronger then his past self too so naruto fans are quite literally objectively wrong when saying the edos are nerfed
Bob you know nothing, Madara verbatim said tobirama was faster back when he was alive
The word used above was boast which means to brag or to self praise. Madara was mocking him and saying your quite slow for somebody who bragged about having fast speed.
In conclusion. Edo tensei are generally portrayed as ether stronger or equal to their original selfs depending on the character or context presented.
