Maybe, I guess he's doing close to 10m EAS a year? I can't help thinking streaming might be overrated in the CSPC methodology, I mean The Beatles were selling maybe 5m/year of their catalog at the peak of album sales (in the 90s), so 10m/year for Eminem seems like a lot...

To differ both artists regarding to the respective Walt Disney soundtrack contributions as performers:

The Lion King OST (1994) has 3/12 tracks performed by Elton John.

Tarzan OST (1999) has 10/14 tracks performed by Phil Collins. Similar situation with Brother Bear OST (2003) which has 10/12 tracks performed by Phil Collins, especially since he co-performed the score with Mark Mancina this time. Additionally, Phil Collins performed the songs on the Spanish, French, German and Italian language versions, an adventure which Elton John never did.

These could be some reasons for the different rating.