This is from the first link.
Deif is considered the official who determines the agenda of the Izz ad-Din al-Qassam Brigades and is regarded as the “brain” behind Hamas.
He is likely hiding underground somewhere inside Gaza, fearing the IDF will try to eliminate him.
Deif started out as a student of Yahya Ayyash, who was nicknamed “the Engineer” and who was the chief bombmaker of Hamas in the late 1990s, when the organization started carrying out suicide bombing attacks within Israel. Ayyash was eliminated by Israel in 1996.
Following Ayyash’s elimination, Deif carried out numerous murderous terror attacks in Israel, including two suicide bombing attacks on buses in Jerusalem and kidnapping attempts within Israel.
Israel tried to kill Mohammed Deif several times, without success. One time, he lost an eye and likely his hand as well. In another attempt he was seriously wounded, his hands and legs were amputated and he has been confined to a wheelchair ever since.Ayyash is the guy who answered his cell phone and had it blow his head off :-)
You can bet that when we get Deif, we will get the same reactions we got when the IDF eliminated Sheikh Ahmad Yassin: That we're going after poor old men in wheelchairs. Right....