[OT question about forums] What does the shading signify?

i always thought the shading of posts signified who is part of Cycling74 and who is a regular 'user'.
but this post confused me and so now i wonder if i was wrong:
https://cycling74.com/forums/duplicated-structures-without-interferences-using
there you can see Emmanuel's posts appear over a slightly different shade than the normal background white of most pages on this site(looks like a light-greyish-pink to me), but Gregory's is not(his is just like the rest of us 'users')? i know they're both part of Cycling(Gregory has written numerous brilliant articles)... so why the difference?

you can also see Ben's has the shading:
https://cycling74.com/forums/upgrade
and so do Jeremy's:
https://cycling74.com/forums/two-faders-controlling-eachother

(if i'm being too invasive, ignore me, i'm just curious. but if not, would love to know...)

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*Never fear, Noob4Life was never here!*