In ancient feudal society, people always liked to emphasize orthodoxy. At that time, Liu Bei, as a down-and-out aristocratic son of the Han Dynasty, was very lonely when he saw the decline of the Han Dynasty. Of course, he would regret that the world laid down by his ancestors was thus contested by local separatist forces. Liu Bei's original idea may be to revive the glory of the Han Dynasty, but Liu Bei can't always work hard for the revival of the Han Dynasty. In the early days of the power struggle, Liu Bei was ready to do something under the banner of helping the Han Dynasty save the Han Dynasty from peril.
However, the development of history is involuntary. Finally, Liu Bei gradually gained his own power and became the leader of a local separatist force, King Shu. It can be said that Liu Bei's purpose gradually became to become a monarch who won the Central Plains. If Liu Bei wanted to restore the Han Dynasty, he would cede the throne to Emperor Xiandi when Shu was founded.
It is unreasonable for Liu Bei to return power to Emperor Xian of Han Dynasty. First of all, Liu Bei made great efforts to recruit talented people before recovering the Han Dynasty. If Liu Bei has the opportunity to become the master of a country, Liu Bei will not give up the power he has established easily in this regard. Secondly, how can these people with lofty ideals who have devoted their lives to Liu Bei agree to work for a new monarch after they have worked hard to establish a foundation? Of course, these interest groups will sincerely support Liu Bei, not an idle Han Xian emperor.
So Liu Bei's efforts to help the Han Dynasty are just a name. If Liu Bei succeeds, it must be Liu Bei who leads his own interest groups to enjoy the fruits of victory, rather than handing them over to Emperor Han Xian.