They broke the mold when they made _______?

It is a simple question I want to know which transformer they could not possible improve on no matter how hard they try.
SEIBERTRON - Your Planet For Everything Transformers
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https://www.seibertron.com/energonpub/viewtopic.php?f=4&t=17269
Burn wrote:Given the amount of repaints I don't think they've ever truly broken molds.
Lapse Of Reason wrote:They broke the mold when they made ... the DinobotsNo reissue for you.
i_amtrunks wrote:G1 Inferno cannot be improved on.