But Edward wished to invade Scotland, so he chose the weaker candidate, who was John Balliol. He had the strongest assert to the throne, and became king on 30 November 1292. Robert Bruce decided to take this selection (his grandson and namesake later on took the throne as Robert I). https://www.uboxmedia.co.uk/find-top-injury-lawyers-providing-expert-guidance-for-your-case/