You know this is a screwed up forum when you see Monero developers attacking Conner while they did not give any credit to Bytecoin but guess what they attacked Bytecoin instead! LOL
Copyright attributions from the Bytecoin->Monero fork were retained, are still there, and appear in virtually every file (a few files that are brand new work don't have it, but even some that are brand new work probably do, since it is easier to just include the same copyright notices everywhere). For example:
Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
Those copyright notices in the Bytecoin code attributed authorship to "the Cryptonote developers" not "Bytecoin"
even well after Monero had already been forked, and that is easily verified in github.
Copyright (c) 2012-2013 The Cryptonote developers
(May 9, 2014, when Monero had been forked in mid April)
As for why Bytecoin had authorship attributed that way can't say. I imagine some sort of internal decision within their group might be responsible but that is just a guess.