you can literally google that:   _sinwar in summary, he was the de-facto political leader of hamas and tactical leader in gaza. the blow is brutal in the sense their big dot at the top of the organization graph is gone. he knew probably most about the organization, the hideouts, where the hostages are, how many etc. probably has direct authority over financials and certainly had direct authority in demands and actions to be taken regarding hostage deals and negotiations. from an organizational perspective, he was the spider in the web. because gaza has many clans and individual groups, he basically knotted them together. but, the web still exists. there will be a new spider but it will take time to reorganize and give him the authority. there might even be a more fine grained authority structure now with the "departments" working together. probably a bit of chaos but in general the mission will not change that much and the guidelines are known. currently with the war it's very hard to communicate with the other cells though. i doubt they are even in touch much anymore with the political leaves in qatar because all comms are dead. if true and that's all they found, sinwar didn't even have a phone or any other means of communication on him when he was found. so he either was already "in the black" or there is still spots where he was communicating. maybe he destroyed those devices or someone else ran off with them. in my opinion, hamas as an organization is pretty much beat. that what is fighting is just loose cells acting individually. my honest guess is most hostages are dead or mia in collapsed tunnels. current policy is "kill when captured". if there are still hostages alive and being fed, they cannot negotiate because communication is almost impossible.
Netherlands