Every proposition of the dialectial seven-fold judgement is either complete or incomplete. In the former, we use only one word the remaining characters to be identical with it. On the other hand, in the Incomplete judgement, we speak of truth as relative to our standpoint. Hence the non-absolute is constituted of the absolute as its elements and as such would not be possible if there were no absolutes. True the basis is always categorical but this categoricality does never clash with the proposition being disjunctive.
Existence is actuality or actual verification, which is unconditional, absolute and categorical.
There is no alternation or condition. But on the level of thought or reason or essence, there may be alternatives. But we cannot live in the world of thought alone and forget existence. We must also have something other than thought or reason which is unreason or irrationlity. There are many grounds of faith - one being the Scriptures.