The fruit in the photo is ST Maui
Thank you, Alex.
Then I believe ST Maui young fruit has the Indian variety smell (Himam Pasand), unless there is an Alphonso graft that had some fruits that fell off and no mature fruit remain. I will look careful to see if there is a grafted branch (alphonso) that holds no fruit.
The tree is a cocktail top-worked from the original FL grafted Glenn, with Okrung Tong, Maha, Edward, Alphonso (to be verified),
ST Maui, Himam Pasand (but the graft is the weakest and only about 5" tall, while other grafts already hold fruits), and Cac Hoa Loc which has not send out any shoots yet after more than 2 years (but the scion, veneer grafted, now grows with the rootstock brand and so now it became flat instead of round, and I don't think it will ever send out any shoots unless I cut off every above it).
Well, this means I won't have any Alphonso fruits to eat this year yet. But I will find out which young fruits fell off that smelled so strong of Indian variety.