Yeah they do combine PH arc and DR arc into DR saga in the wiki. You can see the connection though. I personally think that the Final Saga/Stretch is as some members have previously stated like the Yonko saga which started in FMI. We got introduced to BM, setting up the conflict followed by Kaido in PH and this culminated in Wano where both got defeated. So a total of around 450 chapters for the Yonko saga. But the rate at which the story is progressing with Imu joining the battlefield (even through proxy) it means the end is nearer than our previous estimates.
I think there are three arcs left after Elbaf at most. We already got two of the most anticipated things out of the way from early OP times, VegaPunk and Elbaf. Now we have meeting with Shanks and Dragon left. The islands remaining are MG (not exactly the island), LT and Lodestar (if required) from main points. On villains side we have Imu, BB and Akainu (not a big fan of Admirals as main arc villains theory though).
I think there are three arcs left after Elbaf at most. We already got two of the most anticipated things out of the way from early OP times, VegaPunk and Elbaf. Now we have meeting with Shanks and Dragon left. The islands remaining are MG (not exactly the island), LT and Lodestar (if required) from main points. On villains side we have Imu, BB and Akainu (not a big fan of Admirals as main arc villains theory though).
Enemy are non issue imo even with imu proxy there depending if luffy loses here, oda litterarly spawned 2 extra shanks in less than 100 chapters