He'll get a chance to sell that point to teams during upcoming visits.
That the two teams are bringing in Lock shouldn't surprise given their respective concerns at the position. The Redskins aren't likely to have Alex Smith for a while as he rehabilitates from a gruesome leg injury last season, and the Giants will eventually need to start planning for a future without Eli Manning.
Teams are allowed to host a maximum of 30 pre-draft visits with prospects. They cannot work a player out during a visit but can put the prospect through an interview, and physical and written examinations.