Context is important. Q stated that (saving Israel for last for a very specific reason) in response to a question that some random nazi sympathizing turkey on 4chan (or maybe 8chan at the time) asked about why Q never had anything to say about Israel.

Q's response was a simple deflection- Q didn't have anything worth saying about Israel in regards to the bigger picture of what is/was going on here in America. So, Q gave a response that avoided the question, shut the nazi turkey up, and moved on.

The "very specific reason" [Israel is last] was to misdirect the nazi-lovers, and it worked brilliantly- it keeps the nazis wrongly thinking that Q is gonna expose the Jews, when in fact it allowed Q to ignore the nazis, and let them expose themselves. That's why Israel is "last."