supersaiyangodgogeta said:
Are they part of the 10 strongest people on earth? If not, you already have your answer. That's not my opinon, it's fact.
Okay.
* Did Krillin ever scared off 18 with a Ki Blast ?
* Was Tien ever able to spare well with SSJ Gohan ?
* Was Roshi ever able to hit SSJ Vegeta ?
If not, you have your answer. This isn't my opinion, it's a fact

.
And as for your question, Goku stated that they weren't ready for the multiversal tournament, which is more about experience/behavior than power.