Gerard de Bournonville - Disconnect from Guillaume de Guines dit La Brun

I’m going to disconnect Gerard 1er de Bournonville from his current connected father Guillaume de Guines for the following reasons:

1) there is a false charter involved with the following attribution discussion (translation from French):
“This filiation is correctly attested from Gerard I onwards. A false charter dated 1071 (of the two famous Launay & Christyn) and constant attempts to link themselves to the counts of Guines & through them, to those of Boulogne, by some members of this family have distorted their origins. Anselm and d'Hozier diverging on some points remain nevertheless more prudent, and especially more reliable...”

2) This profile shows a death of 1084 in Palestine. It is known that Gerard participated in the 1st crusade, but that event occurred between 1096-1099. One indication of this is that Gerard bore a coat of arms during the crusade and that blazon is reconstructed in the frieze of Hall 2 of the The Salles des Croisades ("Hall of Crusades") is a set of rooms located in the north wing of the Palace of Versailles. https://en.m.wikipedia.org/wiki/Salles_des_Croisades, for the year 1098. (I will also correct the CoA). Why would anyFrenchman die in Palestine 12 years before the 1st crusade?

3) I have indications in a source that Gerard flourished c. 1035 dying in 1084. The same source shows Guillaume flourishing in c. 1040 dying in 1071. Given these dates, these two men would seem to be of the same generation, not father and son.