Xiao Ran left the matter of receiving and arranging the Roaring Lion Legion entirely to Lelouch. Since the Roaring Lion Legion had refused to participate in the war against the EU, Xiao Ran's original plan to use them as a third party outside Britannia and the EU to forcefully intervene and bring the war to a halt in the short term could no longer continue. To Xiao Ran, the Roaring Lion Legion no longer had any use around Area 19, so he might as well hand them over to Lelouch to arrange. As for any other plans Lelouch might have, Xiao Ran did not ask further. Now that the Roaring Lion Legion had joined them, even if they could not be used in Area 19, there were still plenty of places where they could prove useful.
Even without the Roaring Lion Legion, the task of continuing to pressure the EU had to go on. With direct action against the EU mainland off the table, the war in Area 19 was the only place where they could divert the attention of the EU's participants. Wearing down the forces here, or even eliminating the enemy participants, were both ways of gradually accumulating an advantage.
However, the EU suddenly pulled back its lines and left Britannia no opportunity for a surprise attack. As expected, Selucius of the Roaring Lion Legion must have informed the EU, allowing them to prepare in advance. This was hardly something worth praising for Britannia, and it brought Xiao Ran a measure of unnecessary trouble as well.
If the one who had defeated Selucius had not been Xiao Ran but Emperor Charles, who could mobilize all of Britannia's power, then Selucius would absolutely have incurred Charles's resentment by doing this. But Xiao Ran was the one who had accepted