Gilbert Crispin, baron of Tillieres & Bec
Both had wives names Gunnora, who had fathers, respectively, named Balderic & Baudry?
Either the 2-Gilbert theory is wrong, or one of these Gunnoras is misapplied. Now which one is she?
Medieval Lands identifies Gilbert Crispin as marrying Gunnora, daughter of Balderic:
https://fmg.ac/Projects/MedLands/enguntac.htm#_Toc21079014
GILBERT [I] "Crispin" ... m GUNNORA, daughter of BALDRIC & his wife ---
Gilbert [I] & his wife had five children:
e) [ESILIA ... Either m --- [Malet], son of ---, or m GUILLAUME Malet,
But not Gilbert, grandson of Richard The Fearless, although GIlbert is also referred to "Crispin"
https://fmg.ac/Projects/MedLands/normacre.htm#GeoffreyBrionnedied1015B
GILBERT de Brionne "Crespin" ([979/1000]-murdered [Mar] [1040]) ... m ---. The name of Gilbert's wife is not known.
Since Medieval Lands is taken as Gospel, the only solution that keeps both Gilberts is to have Gilbert de Brionne's wife be UNKNOWN - and to presume that whatever early genealogists that recorded Gilbert de Brionne simply got him mixed up with the other Gllbert. Also, since Gilbert de Brionne doesn't seem to have children known as "Crispin", the other Gilbert should be kept as such.