According to my source, and it's a good one, the pilots in question were the chief pilot and an experienced f/o. No names.
A number of my colleagues fly into GABS and according to them the ILS for runway 06 brings you in higher than your normal 3 degree slope. Do we know what runway they were using? 06 or 24? I suppose that's no excuse for touching down halfway down the runway but i can imagine if you're coming in a little bit too fast and too high, and with the runway being wet it could cause some problems.
I'm based in Dakar and get to hear and see Senegal Airlines operate in and out of Dakar everyday. They seem pretty professional to me, based on what i've heard over the radio.
Just my 2c worth!