I would like to know if the tenses in the paragraph below are used correctly. In addition, there are two questions between brackets that will be happy to be answered. Needless to say that any other correction will be welcomed!
It became clear, retrospectively, 11 days after that meeting, upon the outbreak of Yom Kippur War that King Hussein had known more than had largely been estimated by the Israelis. The king's warning had probably been based on information that had been brought to him by his intelligence services which had managed to get their hands on details regarding the plan of the joint Egyptian-Syrian offensive which had been in the making in Cairo and Damascus. And yet, the king ______ [couldn't or had not been able?] to provide details about the chances of the offensive to eventually be carried out as well as information about[a] date and [a] time [is an indefinite article needed?] of its outbreak. Therefore, he had only outlined his warning without going into detail, thus, making it easy on the Israeli decision makers to disregard it and dismiss it.