WI: Christopher Lekapenos does not predecease his father Emperor Romanos I Lekapenos?

IOTL, Romanos I Lekapenos made his eldest and favorite son, Christopher, co-emperors with himself and his son in lawKonstantinos Macedon. However, before anything substantial came about from his elevation to co-emperor, Christopher passed away before Romanos, eventually paving the way for his younger brothers to overthrow their father before being overthrown themselves and Konstantinos became sole emperor.

What are the potential impacts of Christopher outliving his father? Would he continue his fathers path of ruling in his brother in laws name or would he try to completely replace Konstantinos?
 
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