My understanding from the linked articles was that the retardation of the aircraft was initially normal but then increased. I may have misinterpreted it, but if that is right, then it points towards brakes rather than steering being the issue, unbalance braking then pulling the aircraft to one side. Whether it be an autobrake or an antiskid failure, who knows? It's just speculation, but like I said, if a stowaway climbed the undercarriage leg in Nairobi, and it wouldn't be the first time, then they could have accidentally broken some of the electrical components to the brakes (I think the hydraulic parts are sturdy enough that their damage would be less likely). Hands up - I'm now speculating quite a bit.
