Wallahi there are many Benadiri families who've lived/live in Merca and have long history there. Reer Benadir have settled from Kismayo all the way down South to Barawa (which includes Merca). Merca is actually part of Banaadir. Can you mention a city outside of this region?
I've never claimed Mogadishu unuka leh sxb.
Outside the region? Let's compare Zeila with Mogadishu
This is what it look like before it died and became ruins.
And This is what Mogadishu looked like before Italians came.
And Merca hasn't changed since the Medieval times.
The architecture does seem different I'll have to admit.