With these pre-1200 profiles, if possible it's better not to make decisions, including merges, based on just one source, in this case Charles Cawley's Medieval Lands.
If there is only 1 Lietaud in this genealogy it creates problems.
Giselbert, Lietaud's father is known to have died about 991 or soon after, and according to Cawley, Ada/Adele's son from her second marriage was born about 1070-1075. Even if Lietaud was born close to when his father died, and Ada/Adele was about 40 years when her son was born, that still means Lietaud had to be 40-50 when Ada was born. That's not impossible, but given life expectancy at during this time period, an extra generation in there would seem to make more sense.
Definitely more research needs to take place before a merge of these profiles takes place.