I would stop the circular reference if you concatenated the tables. If you had three tables and concatenated them together you'd have one table, therefore no circular loop.
It really depends on your data and what works best. Concatenation is typically for FACT tables. Joins are normally for reference / dimension tables - generally speaking.
Renaming fields, dropping or the use of qualify (same as renaming) will also stop circular loops be breaking the links. Again, how you would solve the issue would depend on your data. You wouldn't for instance drop a field you needed.
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