It truly seems so, I've followed up on it, and I found in haber7.com that Turkey has two plans in mind. Just as you showed in this picture. The first plan is entering Syria from Tel Abyad with 1000 FSA forces who will be transferred from al-Bab, and additionally 9.000-10.000 FSA fighters will join from the training camps in Hakkari and another city in Turkey. In this plan, the PYD lands will be seperated by a 20 km in width (a long thick line from Tel Abyad until ar-Raqqah).
Second plan is entering from al-Bab, then Manbij, and through Manbij to ar-Raqqah (just like in the picture).
Americans finally realized that they supported the wrong group of people (PYD/Kurds), they realized that it is not an option to fight all groups in Syria with PYD, since Kurdish people in Syria has only limited areas that really belonged to them. Now it seems together with Hulusi Akar (Chief of the General Staff) Turkey has convinced the American authorities with more plausible scenarios. USA has finally realized that even if they lead the operation ar-Raqqah with only PYD, the Arab people won't accept it, and more blood will be spilled.
Now if you ask me, USA is convinced to support the Turkish-backed rebels/FSA (Sultan Murad brigade, and other Türkmen and Arab brigades), possible USA will arm the 9-10 thousand trained FSA brigade trained in Turkey, and there will be lead a joint operation in ar-Raqqah.