3 ideas
A Norman lordship can be read as a firm. Land and loot are its capital, fighting men are its workforce, and the lord's reputation for paying and winning is its credit rating. On this reading, conquest is expansion into a new market. Lords invest men and money where they expect returns, and households gain or lose followers the way firms gain or lose staff.
A fighter with no land, kin network or home institution has only two assets: his skill and his attachment to a patron who is still rising. His loyalty is therefore a running calculation, not a fixed oath. It holds while the lord keeps paying and winning, and it is always open to renegotiation. Rootlessness makes a man more dangerous because he has nothing to fall back on. It also makes him more dependent on one lord's success.
Telling a famous conquest through a minor hired participant strips away its sense of destiny. What remains is a chain of local bargains, grudges, violence and opportunism, and the outcome looks contingent rather than inevitable. The hero's-eye view of history hides how much depended on the self-interested choices of people who had no stake in the cause.