Not really! For a more experienced pilot who knows the home field he will make a judgement on other aircraft up etc !
In your point re the non radio I am sure your instructor would be fully aware of that aircraft and give him total priority?
This happens all the time! Of course on a busy traing day the instructor would make the decision to join the rest but even there would you consider the safe option to slot a 100 kt twin behind 3 75 kts 150 s ?
Even ATC try and avoid that buy giving unusual joining approvals to faster aircraft with experienced pilots!
Gertrude
Or not making unneeded turns which have their own hazards of blind spots and collision threats in the first place ?
Pace